beryllium fluoride
- Formula: BeF2
- Molecular weight: 47.008988
- CAS Registry Number: 7787-49-7
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Gas phase thermochemistry data
Go To: Top, 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°gas | -190.25 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1970 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 54.388 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1970 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 2000. to 6000. |
|---|---|
| A | 14.70150 |
| B | 0.112325 |
| C | -0.022603 |
| D | 0.001558 |
| E | -0.771553 |
| F | -196.6370 |
| G | 69.29670 |
| H | -190.2500 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1970 |
Phase change data
Go To: Top, Gas phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
AC - William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 53.25 | 923. | TE,ME,GS | Greenbaum, Foster, et al., 1963 | Based on data from 823. to 1223. K.; AC |
| 46.99 | 911. | N/A | Novoselova, Semenenko, et al., 1958 | Based on data from 821. to 1002. K.; AC |
| 50.10 | 911. | N/A | Sense and Stone, 1958 | Based on data from 802. to 1021. K.; AC |
| 50.88 | 856. | GS | Sense, Snyder, et al., 1954 | Based on data from 745. to 968. K.; AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 1145.6 to 1372. | 6.13628 | 7577.291 | -211.665 | Cantor, 1965 | Coefficents calculated by NIST from author's data. |
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 56.50 ± 0.69 | 750. | TE | Blauer, Greenbaum, et al., 1965 | Based on data from 713. to 795. K.; AC |
| 55.40 ± 0.41 | 755. | MS | Blauer, Greenbaum, et al., 1965 | AC |
References
Go To: Top, Gas 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]
Greenbaum, Foster, et al., 1963
Greenbaum, Michael A.; Foster, James N.; Arin, M. Louis; Farber, Milton,
THE THERMODYNAMIC AND PHYSICAL PROPERTIES OF BERYLLIUM COMPOUNDS. I. ENTHALPY AND ENTROPY OF VAPORIZATION OF BERYLLIUM FLUORIDE 1,2,
J. Phys. Chem., 1963, 67, 1, 36-40, https://doi.org/10.1021/j100795a009
. [all data]
Novoselova, Semenenko, et al., 1958
Novoselova, A.V.; Semenenko, K.N.; Turova, O.Ya.,
Vestn. Mosk. Univ., Ser. Mat., Mekh., Astron., Fiz., Khim., 1958, 13, 139. [all data]
Sense and Stone, 1958
Sense, Karl A.; Stone, Richard W.,
Vapor Pressures and Molecular Composition of Vapors of the Sodium Fluoride-Beryllium Fluoride System,
J. Phys. Chem., 1958, 62, 4, 453-457, https://doi.org/10.1021/j150562a020
. [all data]
Sense, Snyder, et al., 1954
Sense, K.A.; Snyder, M.J.; Clegg, J.W.,
The Vapor Pressure of Beryllium Fluoride,
J. Phys. Chem., 1954, 58, 3, 223-224, https://doi.org/10.1021/j150513a008
. [all data]
Cantor, 1965
Cantor, S.,
Vapor Pressures of BeF2 and NiF2,
J. Chem. Eng. Data, 1965, 10, 3, 237-238, https://doi.org/10.1021/je60026a008
. [all data]
Blauer, Greenbaum, et al., 1965
Blauer, Jay A.; Greenbaum, Michael A.; Farber, Milton,
The Thermodynamic and Physical Properties of Beryllium Compounds. VII. Enthalpy and Entropy of Sublimation of Beryllium Fluoride,
J. Phys. Chem., 1965, 69, 3, 1069-1070, https://doi.org/10.1021/j100887a508
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔsubH Enthalpy of sublimation ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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