Melting of compressed iron by monitoring atomic dynamics. 13) is almost independent of volume (Table 1); however, the thermal Grneisen parameter (eq. Phys. 286, 556564 (2009). Why do small African island nations perform better than African continental nations, considering democracy and human development? Round your result to 2 decimal places. Inter. One can see in Fig. Earth Planet. Face-Centered Cubic2a. J. Geophys. By what percent is the radius of 239 92 U greater than the radius of 232 92 U? (Definition, Examples, and Metallurgy), The Difference Between Alloys and Composites (and Compounds), The Hume-Rothery Rules for Solid Solution. It is halved. (a) Calculate the radius of ^{58}\textrm{Ni}, one of the most tightly bound stable nuclei. Another scientific group75 placed the liquid triple point at 60GPa and 2800K using pressures calculated from the EoS of hcp-Fe12 and EoS of MgO76. The following transition can be caused by the kinetics of the transition process or the effect of fcc-Fe and hcp-Fe magnetic moment. The austenite allotrope is named after Sir William Chandler Roberts-Austen (1843 . Res. 84, 36383641 (2000). b. doubles. Calculated phase diagram of iron at pressures up to 16GPa in comparison with reference data7,11,68,69,70. Tsujino, N. et al. Yamazaki, D. et al. True or false? A then what is the lattice parameter? 2. The Hexagonal Close-Packed (HCP) crystal structure is one of the most common ways for atoms to arrange themselves in metals. Double Hexagonal Close-Packed (La-type)5. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 114, B03208 (2009). Austenite is a metallic, non-magnetic solid solution of carbon and iron that exists in steel above the critical temperature of 1333F ( 723C). Both these phenomena and also the methods of preventing the destruction of materials are presented. 7.8 A sheet of BCC iron 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 725 C. After having reached steady state, the iron . 23, 953956 (1996). An monatomic ideal gas at 300 K has a volume of 15 liters at a pressure of 15 atm. See Page 1. You can read all about interstitial sites in this article, but BCC has two types of interstitial sites: octahedral and tetrahedral. a. The density, adiabatic bulk modulus and P-wave velocity of liquid Fe calculated up to 328.9GPa at adiabatic temperature conditions started from 5882K (outer/inner core boundary) were compared to the PREM seismological model. The body-centred position is empty. Miner. Calculate the volume change in percentage during. An equation of state for liquid iron and implications for the Earths core. The fitted parameters of the EoSs for bcc-Fe, fcc-Fe, hcp-Fe, and liquid iron (Table 1) were obtained by simultaneous optimization of the experimental measurements of the heat capacity, volume and thermal expansion, adiabatic bulk modulus at room pressure, and PVT data (all references are included in the Supplementary Information). Martensite is not shown in the equilibrium phase diagram of the iron-carbon system . The diffusion coefficient of carbon FCC iron is lower than BCC iron because a) the temperature is higher for FCC b) FCC has a higher packing factor c) FCC is more cubic d) Carbon is substitional i At moderate and high pressures, such extrapolation provides reliable results with a close agreement with reference data20. That picture shows two unit cells of the fcc lattice. Accordingly, in equation (1) for liquid Fe, the magnetic part is excluded, whereas the entropy parameter is added: The reference temperature for liquid Fe at 0.1MPa is T0=1811K. Along the reference isotherm, the pressure was calculated using eq. In this work, we propose updated EoSs for Fe phases based on a formalism from our recent publications29,30,31,32,33,34,35,36. Calphad 29, 6889 (2005). The pressure in this work was estimated before laser heating using the old ruby scale78. [19], The exact temperatures at which iron will transition from one crystal structure to another depends on how much and what type of other elements are dissolved in the iron. What is the Materials Science Tetrahedron (Paradigm)? ADS You will receive a link and will create a new password via email. Choose the best answer to the following. 2-At 912 C, iron changes from . Earth Planet. The A2 forms the boundary between the beta iron and alpha fields in the phase diagram in Figure 1. Gamma-rays pass through a 4.1 cm slab of copper. 1. (2). When the area of an expanding square, in square units, is increasing three times as fast as its side is increasing, in linear units, the side of the square is what? Geophys. The obtained EoSs allow calculation of PVT relations and thermodynamic properties of Fe at the Earths core conditions (up to 6000K and 350GPa). What is the Difference Between Materials Science and Chemical Engineering? Given Parameter in Lattice parameter of BCC = Side of cenit cell of a Bec iron - abce = 2 . Klotz, S., Le Godec, Y., Strassle, T. & Stuhr, U. Find the permeability of annealed iron at saturation. Differentiating eq. When small pieces of material are assembled into a larger piece, the combined surface area: (a) greatly increases. Write copper, steel, rubber, and glass in the increasing order of their elasticity. The solution required X mL of a potassium dichromate solution for the oxidation of iron content to the ferric state. The figure below shows, the unit cell of iron, which is a body centered cubic (bcc) lattice with two iron atoms per unit cell. The magnetic moment10,37 of bcc-Fe is B0=2.22. Miner. 41, 850864 (2003). If you want to learn about specific crystal structures, here is a list of my articles about Bravais lattices and some related crystal structures for pure elements. 20 are very consistent; however, entropy is consistent only at temperatures close to the melting line (Supplementary Figure S11). Under this new scenario, how much more energy will be striking the child's eardrums each second? Mechan. Google Scholar. Later, the point was shifted back to 75GPa and 2700K74. An aluminum plate has a length of 0.13 m and a width of 0.12 m at 23^{\circ}C. The plate is uniformly heated to 236^{\circ}C. If the linear expansion coefficient for aluminum is 2.3 \times 10^{-5}/^{\circ}C, what is the change in the area of the plate as. A cylindrical copper rod has resistance R. It is reformed to twice its original length with no change of volume. Dinsdale, A. T. SGTE data for pure elements. Google Scholar. It becomes twice as large. PNAS 115, 39163919 (2015). At 10.5GPa and 753K7 (or by more precise and recent measurements at 8.2GPa and 678K11), there is a triple point between bcc-Fe, fcc-Fe, and the high-pressure phase hcp-Fe, which has the hexagonal close-packed (hcp) structure (hcp-Fe). The study94 based on new measurements of sound velocity and reassessment of previously obtained shock data established the melting temperature of the iron between 5100500K at P=2253GPa and 6100500K and P=2603GPa on the Hugoniot curve. The alloy was synthesized through a special casting process that yielded high solidification rates. 30, 325331 (2010). Lett. This same trend appears for ruthenium but not osmium. When an element ejects a beta particle, the atomic number of that element (a) reduces by 1. Lett. The calculated thermodynamic properties (P, T, x=V/V0, , S, CV, CP, KT, KS, th, K, and Gibbs energy, G) for -Fe (bcc-Fe) are listed in Supplementary Table S1 (see also bcc-Fe.xls in the Supplementary Information). However, in previous studies, 80 eV He + irradiation induced a series of phase structure changes in single-phase BCC-structured Al-Cr-Fe-Ni HEA due to intense vacancy-mediated atomic diffusion during irradiation, i.e. we told the simple way of calculations of relative volume change in transformation of BCC iron to FCC Iron. So, if we want to know the volume change, we just have to look at the packing fractions of the two forms. 77 is located at a higher temperature than most determined triple points (Fig. Earth Planet. Rev. A. Fei, Y. et al. The ratio of density of the crystal before heating and after heating is [atomic weight of F e =56 ]A. In these calculations, the volume contribution to the Gibbs energy was calculated using the AndersonGrneisen parameter23. Hexagonal Close-Packed4b. ), or their login data. In order to wake a sleeping child, the volume on an alarm clock is tripled. Based on these data, the adiabatic bulk modulus at the ICB conditions is consistent with isentropes of 7000K and at the ICB with isentropes of 5000K (see Fig. (With Examples Beyond Carbon). 36, 157161 (1965). Look for this article in the future on our website! Problem #2 . The face-centered cubic structure has an atom at all 8 corner positions, and at the center of all 6 faces. W is the prototype for BCC.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'msestudent_com-medrectangle-3','ezslot_6',142,'0','0'])};__ez_fad_position('div-gpt-ad-msestudent_com-medrectangle-3-0'); The Body-Centered Cubic (BCC) unit cell can be imagined as a cube with an atom on each corner, and an atom in the cubes center. Miner. At the transformation temperature the lattice parameter of BCC iron is 28 . Jephcoat, A. P., Mao, H. K. & Bell, P. M. Static compression of iron to 78 GPa with rare gas solids as pressure-transmitting media. Boehler, R., Santamara-Prez, D., Errandonea, D. & Mezouar, M. Melting, density, and anisotropy of iron at core conditions: new X-ray measurements to 150 GPa. But in between them, rotated by $45^\circ$, is the unit cell of the bcc lattice, stretched along the $z$ axis. Science Lett. Rev. How does the number of atoms in a 27.5-gram iron ring compare to the number in a chrome ring of the same mass? Res. Yield Stress, Yield Strength, and Yield Point, Elasticity and Youngs Modulus (Theory, Examples, and Table of Values), True Stress-Strain vs Engineering Stress-Strain, Stress, Strain, and the Stress-Strain Curve, What Are Shape Memory Alloys? P-V-T equation of state for epsilon-iron up to 80GPa and 1900K using the Kawai-type high pressure apparatus equipped with sintered diamond anvils. Res. How can I use it? Internet Explorer). The hcp-Fe melts at 4033K and at higher temperatures the liquid is the only stable phase. As was shown recently59, this scale underestimates pressure by 0.5GPa (at 1015GPa) in comparison with another NaCl EoS60. The calculated segregation energy difference between the grain boundary and the . (b) increases by 1. In addition, from the obtained parameters one can calculate the coefficient of thermal expansion =(P/T)V/KT, heat capacity at constant pressure CP=CV+2TVKT, and adiabatic bulk modulus KS=KT+VT(KT)2/CV, which can also be compared with direct experimental measurements. In Treatise on Geochemistry Vol. In situ X-ray diffraction studies of iron to Earth-core conditions. 3. If you brought iron below room temperature, however, there would not be enough thermal energy to activate all the slip systems. 86, 58015808 (1999). This can be made clear by figure 6. . (d) is unchanged. 408, 155162 (2014). 1.231 Using the hard sphere model, which imagines each atom as a discrete sphere, the BCC crystal has each atom touch along the body diagonal of the cube. View the full answer. In the past, the paramagnetic form of -iron was known as beta iron (-Fe). [1] As of December 2011[update], recent and ongoing experiments are being conducted on high-pressure and superdense carbon allotropes. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'msestudent_com-banner-1','ezslot_4',123,'0','0'])};__ez_fad_position('div-gpt-ad-msestudent_com-banner-1-0');If you wanted to describe the face-centered cubic crystal with math, you would describe the cell with the vectors. & Garbarino, G. Low temperature equation of state of epsilon-iron. J. Iron (Fe) undergoes an allotropic transformation from a BCC to FCC structure system. At 0.1MPa the calculated entropy20 of solid phases of Fe decreases much faster than in our EoSs. BCC has 2 atoms per unit cell, lattice constant a = 4R/3, Coordination number CN = 8, and Atomic Packing Factor APF = 68%. Not to be confused with, Experimental high temperature and pressure, "The magnetic state of the phase of iron", https://en.wikipedia.org/w/index.php?title=Allotropes_of_iron&oldid=1137712070, This page was last edited on 6 February 2023, at 01:58. 49 corrected based on pressure scales31,35. Phys. B. Yes, that's correct. The Mechanic. Res. In this form it is called gamma iron (-Fe) or austenite. Rev. Explain. 257 (Springer Science+Business Media, New York, 1971). High-pressurehigh-temperature equation of state of KCl and KBr. d. does not increase at all. 0.1292 nm respectively. a-e transition pathway of iron under quasihydrostatic pressure conditions. Phys. Expert Answer. The Helmholtz free energy depends on temperature and volume; thus, its derivatives yield entropy and pressure . Kohlhaas, R., Dunner, P. & Schmitz, P. N. Uber die temperaturabhangigkeit der gitterparameter von Eisen, Kobalt und Nickel im bereich hoher temperaturen. Science 236, 181182 (1987). Phys. Jing, Z. et al. 18) decreases with increase of temperature and pressure up to 1.51.6 at 100GPa and 30004000K (Supplementary Table S2). We thank the reviewers for critical comments and suggestions. : Condens.Matter 19 326220) and by Lee et al (2012 J. The fitted parameters of EoS for liquid Fe are listed in Table 1. A The reduction in size of food particles as food is chewed B The movement of food to the stomach after food is swallowed C The, Two rods, of lengths, l1 and l2, are made from materials, whose coefficient of linear expansion are a1 and a2, respectively. 92, 93199325 (1987). Why? BCC also has 12 tetrahedral sites, which means that a small interstitial atom could fit in 12 positions such that it is equally surrounded by 4 FCC lattice atoms. Pressures in the PVT dataset were corrected based on the self-consistent ruby pressure scale or EoSs of Au, MgO, and W31,35,36. The ratio of the population. Phys. Mao, H. K., Bell, P. M., Shaner, J. W. & Steinberg, D. J. When the length of each side of a square is increased by 5 inches, the area is increased by 85 in^2. 91, 74857494 (1986). BCC metals have a ductile-to-brittle transformation temperature (DBTT), which means that they are brittle at lower temperatures and ductile at higher temperatures. Slip systems are the way that atoms slide past each other when deforming. Altshuler, L. V., Brusnikin, S. E. & Kuzmenkov, E. A. Isotherms and Gruneisen functions for 25 metals. How many excess electrons are on the sock? & Bi, W. Sound velocities of bcc-Fe and Fe0.85Si0.15 alloy at high pressure and temperature. Nature 427, 339342 (2004). copyright 2003-2023 Homework.Study.com. [12] When it dissolves in iron, carbon atoms occupy interstitial "holes". Earth Planet. Please briefly explain why you feel this answer should be reported. & Litasov, K. D. Self-consistent pressure scales based on the equations of state for ruby, diamond, MgO, B2-NaCl, as well as Au, Pt and other metals to 4 Mbars and 3000 K. Russ. 45 to obtain the correct limit of entropy at 0K. The magnetic contribution to the Helmholtz free energy can be expressed as45: where B0 is an average magnetic moment per atom, =T/T*, T* is the critical temperature (TC for ferromagnetic materials and Neel temperature TN for paramagnetic materials). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Supplementary Figure S12 shows isochores of liquid Fe calculated from our EoS and plotted in comparison with PVT data calculated by ab initio molecular dynamics simulations95,96. The smallest possible unit cell is called the primitive cell. Body-Centered Orthorhombic12. The DFT calculations in this study enable us to understand how different amounts of H change the unit-cell volume of fcc FeH x alloy and then . Zarkevich, N. A. Some Cr2O3 at 25C was added into it, which cause the following exothermic reaction to occur: 4). Phys. The phase diagram of Fe is relatively complex due to the existence of several polymorphic modifications7,8. If you are interested in why BCC metals have different properties than FCC metals (another common structure), you should check out this article. a) If a page is reduced to 80%, what percent enlargement is needed to return it to its original size? Lithium, sodium, potassium, vanadium, chromium, iron, rubidium, niobium, molybdenum, cesium, barium, europium, tantalum and tungsten all have the BCC crystal structure. Calculate the relative volume change from BCC to FCC crystal structure (12 POINTS) b. At this transition, the heat capacity of Fe has a characteristic -shape form with a maximum at TC9,10. The equation for the Helmholtz free energy for liquid metal can be rewritten38,39,40. True or False? 3). What is the Difference Between Materials Science and Chemistry? Brosh, E., Makov, G. & Shneck, R. Z. 121, 022018 (2008). In another paper54, the measurement was performed in non-hydrostatic conditions and deviates from our data at higher pressures. Geodyn. B 90, 014422 (2014). If B0=0.14, then melting of the hcp-Fe is observed at 7150K and 328.9GPa and is in agreement with the computer calculations90. 3.6 g/cm^3 to kg/m^3 b. Face-Centered Orthorhombic11. Science Lett. This point was also placed at 100GPa and 2700K1. Specific volume measurements of Cu, Mo, Pd, and Ag and calibration of the ruby R1 fluorescence pressure gauge from 0.06 to 1 Mbar. Rev. Ruban, A. V., Belonoshko, A. Our experts can answer your tough homework and study questions. It becomes twice as large. Alfe, D. Temperature of the inner-core boundary of the Earth: Melting of iron at high pressure from first-principles coexistence simulations. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The melting curve of iron to 250 gigapascals: A constraint on the temperature at Earths center. The body-centered cubic cell belongs to space group #229 or , Strukturbericht A2, and Pearson symbol cI2. Why? CAS What is the density of FCC -iron at 20C? 375, 244253 (2013). 396, 7887 (2014). 42, 32393244 (1973). The pressure scales are shown in the legends to the figures. Lost your password? 4.1) 4.2} Calculate the volume change associated with the change in crystal structure from BCC to FCC if at 912C the BCC unit cell had a lattice constant a = 0.293 nm and the FCC unit cell a lattice constant a ' = 0.363 11131. Supplementary Figure S5 shows that our EoS for bcc-Fe is reliably consistent with experimental measurements49,50,51, which were obtained in quasihydrostatic conditions in He or Ne pressure media. If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty? Anyone you share the following link with will be able to read this content: Sorry, a shareable link is not currently available for this article. Dependence of pressure on molar volume near the transition in iron. Dorogokupets, P. I. Calculate the linear density for [111] direction in . Differentiation of the thermal pressure with respect to temperature at constant volume gives the pressure slope at constant volume: The volume dependence of and q was accepted in the Altshuler form44: The volume dependence of the Einstein temperature can be expressed as: In eqs (12,13,14,15) 0 is the Grneisen parameter at reference conditions, is the Grneisen parameter at infinite compression (x=0), and is a fitted parameter. The calculated isentropic temperature profile for hcp-iron and liquid iron started from 6000K based on the reference data95 are also presented in Fig. Figure 5b shows adiabatic bulk modulus and density for solid and liquid iron calculated from our EoSs in comparison with PREM72 and the calculated model95. Iron (Fe) undergoes an allotropic transformation at 912 C: upon heating from a BCC (phase) to an FCC ( phase). C. 4. The phase boundary between the different solid phases is drawn on a binary phase diagram, usually plotted as temperature versus percent iron. Scientific Reports (Sci Rep) Molodets, A. Thermodynamic potentials and non-monotonic melting curve of sodium at high pressure. Research Article. Calculate the percent change in density from BCC to FCC. It is one of the most common structures for metals. The amount of -Fe depends on the cooling process. It is thermodynamically stable and a fairly soft metal. BCC BCC structures have no close packed planes. B 91, 174105 (2015). For a great reference for all crystal structures, check out The AFLOW Library of Crystallographic Prototypes., Single-Element Crystal Structures and the 14 Bravais Lattices. Total number of atoms per unit cell = 2. The inner core of the Earth is generally assumed to consist essentially of a crystalline iron-nickel alloy with structure. B. inversely proportional. That is, 68% of the volume of the BCC unit cell is occupied by atoms and the remaining 32% is empty space. 15 GPa before transforming into a high-pressure form termed -Fe discussed below. CAS Funtikov, A. Sokolova, T. S., Dorogokupets, P. I. Nishihara, Y. et al. When you increase r by a factor of 3, 1 r^2 will by a factor of . HC-1679 (ESRF, Grenoble, 2014). A discontinuity in sound velocities of iron at 200GPa may mark the transition of hcp-iron to fcc iron. It is doubled. Iron has a BCC structure at room temperature. Delta iron (-Fe) Peculiarly, above 1,394 C (2,541 F) iron changes back into the bcc structure, known as -Fe. All BCC metals have a DBTT. this structural change. Many of its properties arise because the next-nearest neighbors bond nearly as powerfully as the nearest neighbors. B. For achieving a more closed packing structure as compared to the cubic lattice, there can be two possibilities, the body-centered cubic lattice (BCC) or the face-centered cubic lattice (FCC). Science Lett. Simple Monoclinic13. Chem. Hirose, K., Labrosse, S. & Hernlund, J. J. Appl. & Oganov, A. R. Ruby, metals, and MgO as alternative pressure scales: A semiempirical description of shock-wave, ultrasonic, x-ray, and thermochemical data at high temperatures and pressures. M. N. Magomedov. Aitta, A. This may be one reason that most high melting point metals have a BCC structure. Translate surface iron contamination of 1010 atoms/cm^2 into a number of monolayers. By copying an already reduced copy, further reductions can be made. How many atoms belong to BCC cell? Answer to Question #175035 in Mechanical Engineering for Varun. Id recommend reading Kelly & Knowles, Crystallography and Crystal Defects if you want to prove this, and if you want to prove that only 5 of these are independent. B 79, 060101 (2009). C. It becomes 8 times as great. Being about twice the diameter of the tetrahedral hole, the carbon introduces a strong local strain field. Lett. PubMed Appl. Nature 424, 10321034 (2003). (d) is reduced to one-quarter its original value. Write the factors on which the change of the length of metal in linear expansion depends. Lett. 1. When heated, it transforms from BCC to FCC at 1185 K. The atomic radii of iron atoms at this temperature are 0.126 and 0.129 nm for bcc and fcc, respectively. Make sure to explain clearly the different steps you have undertaken to come up with the solution. Brown, M. J. Article . 1.069B. Assume that impure copper contains only Fe, Au and Ag as impurities. (2) with respect to volume, we obtain the bulk modulus at reference isotherm T0=298.15K and its pressure derivative: The potential energy at the 298K isotherm is: The thermal part of the Helmholtz free energy can be expressed via the Einstein model, which coincides with the Debye model at the high-temperature limit43: where is the characteristic temperature depending on volume, which is related to the Debye temperature (D) via =0.75 D; n is the number of atoms in the chemical formula of the compound, and R is the gas constant. The Definitive Explanation. [14] -iron can dissolve as much as 0.08% of carbon by mass at 1,475C. Article What is the Difference Between Polymorphism and Allotropy? Geodyn. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . The bcchcp line is located in the stability field of either the fcc-Fe or liquid at high pressures. c. It is unchanged. How does the number of atoms in a 27.5 gram iron ring compare to the number in a chrome ring of the same mass? Meanwhile, this assumption is made based on the equilibrium thermodynamics, the shock data93 on the iron shows two phase transitions on the Hugoniot curve at pressures from 77 to 400GPa. What is the cutoff, saturation, and active region in a transistor? J. Phys. Find the number of third nearest neighbors and their distance for the: SC, BCC, and FCC structures. & Dewaele, A. Equations of state of MgO, Au, Pt, NaCl-B1, and NaCl-B2: Internally consistent high-temperature pressure scales. One more experimental dataset64 overestimates pressures by up to 6GPa compared with our data for fcc-Fe. The 298K isotherm for -Fe was calculated using the compressibility curve from ref. 2 and the pressure was determined using the ruby scale82 with corrections for thermal pressure (note that at Fig. Heat capacities of -Ti and -Ti above 300 K are 33.6 and 29.5 J/mol-K, respectively. 1. Use this information to calculate Avogadro's number. 3, 129166 (2012). Article Article b. In elements that reduce the gamma phase range, the alpha-gamma phase boundary connects with the gamma-delta phase boundary, forming what is usually called the Gamma loop. (b) slightly increases. J. Geophys. Phys. Sign up for the Nature Briefing newsletter what matters in science, free to your inbox daily. At higher pressures, the fcc phase is in the stability field of the liquid. (c) halves. Umemoto, K. et al. Dorogokupets, P. I., Sokolova, T. S. & Litasov, K. D. Thermodynamic properties of bcc-Fe to melting temperature and pressure to 15 GPa. Inter. 91, 46734676 (1986). Fitting parameters for our EoS for liquid iron were calculated using the following assumptions (as a starting point for calculations): (i) the Gibbs energy of -Fe and liq-Fe must be the same at 1811K and 0.1MPa; (ii) the entropy of liquid Fe increases by 7.626Jmol1K1 upon melting9 in comparison with the entropy of -Fe; (iii) the melting line of Fe was taken from ref. Sciences 41, 657691 (2013). MATH b) What is the change in the period in seconds? At the condition of the inner core boundary (~330GPa and ~6000K), our EoS is in good agreement with the EoS obtained in ref. Chem. Dewaele, A. et al. Miner. What happens to the field if the radius is doubled? Miner. High Press. Figure 5a shows the calculated isentropic temperature profile started from ICB conditions for liquid iron. The Curie temperature (TC) of 1043K marks the transition to the paramagnetic state with the same structure. The images or other third party material in this article are included in the articles Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. D. It is reduced to 1/8th of its original value. The transformation from fcc to bcc can be considered as a homogeneous distortion, like that in figure 2.
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