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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 700. | 700. - 1042. | 1042. - 1100. | 1100. - 1809. | 298. - 1809. |
|---|---|---|---|---|---|
| A | 4.404561 | -13806.80 | -77.88860 | -185.6450 | 5.730041 |
| B | 5.889821 | 32963.60 | 6.914140 | 219.7420 | 1.999941 |
| C | -2.130430 | -29343.50 | 0.000000 | -91.71090 | 0.000066 |
| D | 2.309920 | 9245.320 | 0.000000 | 13.64280 | -0.000021 |
| E | -0.003022 | 954.3690 | 98.46150 | 57.87211 | -0.000001 |
| F | -1.570990 | 5754.940 | 178.2560 | 166.7360 | 0.064060 |
| G | 10.16130 | -20880.50 | 57.80990 | -133.4530 | 14.83350 |
| H | 0.000000 | 0.000000 | 0.000000 | 0.000000 | 1.861381 |
| 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 (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 298. | 6.00 | 6.53 | 6.53 | -0.00 |
| 300. | 6.01 | 6.57 | 6.53 | 0.01 |
| 400. | 6.55 | 8.37 | 6.77 | 0.64 |
| 500. | 7.09 | 9.89 | 7.25 | 1.32 |
| 600. | 7.66 | 11.23 | 7.80 | 2.06 |
| 700. | 8.27 | 12.46 | 8.38 | 2.85 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 700. | 8.24 | 12.60 | 8.48 | 2.89 |
| 800. | 9.05 | 13.63 | 9.06 | 3.65 |
| 900. | 10.28 | 14.81 | 9.63 | 4.66 |
| 1000. | 12.99 | 15.94 | 10.20 | 5.73 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1042. | 20.00 | 16.47 | 10.37 | 6.36 |
| 1100. | 11.09 | 17.31 | 10.71 | 7.25 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1100. | 11.09 | 17.22 | 10.71 | 7.16 |
| 1200. | 9.75 | 18.12 | 11.29 | 8.20 |
| 1300. | 9.25 | 18.88 | 11.85 | 9.14 |
| 1400. | 9.20 | 19.56 | 12.37 | 10.06 |
| 1500. | 9.38 | 20.20 | 12.87 | 10.99 |
| 1600. | 9.65 | 20.81 | 13.35 | 11.94 |
| 1700. | 9.92 | 21.41 | 13.81 | 12.92 |
| 1800. | 10.17 | 21.98 | 14.25 | 13.92 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 298. | 6.33 | 8.49 | 8.50 | -0.00 |
| 300. | 6.33 | 8.53 | 8.50 | 0.01 |
| 400. | 6.53 | 10.38 | 8.75 | 0.65 |
| 500. | 6.73 | 11.86 | 9.23 | 1.32 |
| 600. | 6.93 | 13.11 | 9.77 | 2.00 |
| 700. | 7.13 | 14.19 | 10.33 | 2.70 |
| 800. | 7.33 | 15.15 | 10.87 | 3.43 |
| 900. | 7.53 | 16.03 | 11.40 | 4.17 |
| 1000. | 7.73 | 16.83 | 11.90 | 4.93 |
| 1100. | 7.93 | 17.58 | 12.38 | 5.72 |
| 1200. | 8.13 | 18.28 | 12.85 | 6.52 |
| 1300. | 8.33 | 18.94 | 13.29 | 7.34 |
| 1400. | 8.53 | 19.56 | 13.72 | 8.18 |
| 1500. | 8.73 | 20.16 | 14.12 | 9.05 |
| 1600. | 8.93 | 20.73 | 14.52 | 9.93 |
| 1700. | 9.13 | 21.27 | 14.90 | 10.83 |
| 1800. | 9.33 | 21.80 | 15.27 | 11.76 |
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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