iron difluoride
- Formula: F2Fe
- Molecular weight: 93.842
- CAS Registry Number: 7789-28-8
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -389.53 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 265.19 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
Gas Phase Heat Capacity (Shomate Equation)
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) | 3000. to 6000. |
|---|---|
| A | 62.73657 |
| B | 2.239336 |
| C | -0.646198 |
| D | 0.050511 |
| E | 1.021960 |
| F | -407.1086 |
| G | 340.4655 |
| H | -389.5304 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -674.55 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 92.54 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -705.84 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 86.95 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
Liquid Phase Heat Capacity (Shomate Equation)
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) | 1373. to 3000. |
|---|---|
| A | 98.32400 |
| B | 2.199027×10-10 |
| C | -1.201491×10-10 |
| D | 2.045362×10-11 |
| E | 7.122801×10-12 |
| F | -703.8660 |
| G | 211.5246 |
| H | -674.5487 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Solid Phase Heat Capacity (Shomate Equation)
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. to 1373. |
|---|---|
| A | 61.53451 |
| B | 39.87026 |
| C | -23.89562 |
| D | 4.905782 |
| E | -0.297405 |
| F | -726.7650 |
| G | 148.8768 |
| H | -705.8408 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 271. ± 2.0 | kJ/mol | N/A | Bardi, Brunetti, et al., 1996 | |
| ΔsubH° | 270. ± 3. | kJ/mol | N/A | Zhuravleva, Alikhanyan, et al., 1976 | See also Bardi, Brunetti, et al., 1996. |
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 263. ± 2.0 | 1068. | TE,ME | Bardi, Brunetti, et al., 1996 | Based on data from 958. to 1178. K. |
| 263. ± 3. | 995. | ME | Zhuravleva, Alikhanyan, et al., 1976 | Based on data from 848. to 1142. K. See also Bardi, Brunetti, et al., 1996. |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, 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]
Bardi, Brunetti, et al., 1996
Bardi, Gianpiero; Brunetti, Bruno; Piacente, Vincenzo,
Vapor Pressure and Standard Enthalpies of Sublimation of Iron Difluoride, Iron Dichloride, and Iron Dibromide,
J. Chem. Eng. Data, 1996, 41, 1, 14-20, https://doi.org/10.1021/je950115w
. [all data]
Zhuravleva, Alikhanyan, et al., 1976
Zhuravleva, L.V.; Alikhanyan, A.S.; Sidorov, L.N.,
Russ. J. Phys. Chem., 1976, 50, 818. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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