iron
- Formula: Fe
- Molecular weight: 55.845
- IUPAC Standard InChI: InChI=1S/Fe
- IUPAC Standard InChIKey: XEEYBQQBJWHFJM-UHFFFAOYSA-N
- CAS Registry Number: 7439-89-6
- Chemical structure:
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- Information on this page:
- Other data available:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Solid Phase Heat Capacity (Shomate Equation)
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 700. | 700. - 1042. | 1042. - 1100. | 1100. - 1809. | 298. - 1809. |
|---|---|---|---|---|---|
| A | 18.42868 | -57767.65 | -325.8859 | -776.7387 | 23.97449 |
| B | 24.64301 | 137919.7 | 28.92876 | 919.4005 | 8.367750 |
| C | -8.913720 | -122773.2 | 0.000000 | -383.7184 | 0.000277 |
| D | 9.664706 | 38682.42 | 0.000000 | 57.08148 | -0.000086 |
| E | -0.012643 | 3993.080 | 411.9629 | 242.1369 | -0.000005 |
| F | -6.573022 | 24078.67 | 745.8231 | 697.6234 | 0.268027 |
| G | 42.51488 | -87364.01 | 241.8766 | -558.3674 | 62.06336 |
| H | 0.000000 | 0.000000 | 0.000000 | 0.000000 | 7.788015 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | α-δ phase; Data last reviewed in March, 1978 | α-δ phase; Data last reviewed in March, 1978 | α-δ phase; Data last reviewed in March, 1978 | α-δ phase; Data last reviewed in March, 1978 | γ phase; Data last reviewed in March, 1978 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 298. | 25.09 | 27.31 | 27.32 | -0.00 |
| 300. | 25.14 | 27.48 | 27.32 | 0.05 |
| 400. | 27.40 | 35.02 | 28.34 | 2.67 |
| 500. | 29.68 | 41.38 | 30.32 | 5.53 |
| 600. | 32.06 | 47.00 | 32.64 | 8.61 |
| 700. | 34.60 | 52.13 | 35.06 | 11.94 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 700. | 34.48 | 52.74 | 35.47 | 12.08 |
| 800. | 37.85 | 57.01 | 37.90 | 15.29 |
| 900. | 43.00 | 61.97 | 40.30 | 19.50 |
| 1000. | 54.35 | 66.69 | 42.70 | 24.00 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 1042. | 83.68 | 68.90 | 43.38 | 26.60 |
| 1100. | 46.40 | 72.41 | 44.82 | 30.34 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 1100. | 46.39 | 72.06 | 44.81 | 29.97 |
| 1200. | 40.77 | 75.82 | 47.25 | 34.29 |
| 1300. | 38.68 | 78.99 | 49.57 | 38.25 |
| 1400. | 38.50 | 81.84 | 51.77 | 42.09 |
| 1500. | 39.26 | 84.52 | 53.87 | 45.98 |
| 1600. | 40.37 | 87.09 | 55.86 | 49.96 |
| 1700. | 41.52 | 89.57 | 57.77 | 54.05 |
| 1800. | 42.57 | 91.97 | 59.61 | 58.26 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 298. | 26.47 | 35.53 | 35.55 | -0.00 |
| 300. | 26.48 | 35.71 | 35.55 | 0.05 |
| 400. | 27.32 | 43.44 | 36.59 | 2.74 |
| 500. | 28.16 | 49.63 | 38.60 | 5.51 |
| 600. | 29.00 | 54.84 | 40.89 | 8.37 |
| 700. | 29.83 | 59.37 | 43.21 | 11.31 |
| 800. | 30.67 | 63.41 | 45.49 | 14.34 |
| 900. | 31.51 | 67.07 | 47.68 | 17.45 |
| 1000. | 32.34 | 70.43 | 49.79 | 20.64 |
| 1100. | 33.18 | 73.55 | 51.81 | 23.91 |
| 1200. | 34.02 | 76.48 | 53.75 | 27.27 |
| 1300. | 34.85 | 79.23 | 55.60 | 30.72 |
| 1400. | 35.69 | 81.85 | 57.38 | 34.24 |
| 1500. | 36.53 | 84.34 | 59.10 | 37.86 |
| 1600. | 37.36 | 86.72 | 60.75 | 41.55 |
| 1700. | 38.20 | 89.01 | 62.35 | 45.33 |
| 1800. | 39.04 | 91.22 | 63.89 | 49.19 |
References
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Notes
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), References
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