Diberyllium dioxide
- Formula: Be2O2
- Molecular weight: 50.0232
- CAS Registry Number: 70478-90-9
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Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics 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 | -410.03 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1963 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 247.61 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1963 |
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) | 298. to 600. | 600. to 6000. |
|---|---|---|
| A | 1.315421 | 78.74665 |
| B | 215.2304 | 2.980398 |
| C | -234.9546 | -0.695816 |
| D | 97.94451 | 0.053641 |
| E | 0.190452 | -4.695745 |
| F | -417.4699 | -447.5834 |
| G | 195.6811 | 320.6400 |
| H | -410.0324 | -410.0324 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in September, 1963 | Data last reviewed in September, 1963 |
Gas phase ion energetics 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:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 11.1 ± 0.4 | EI | Theard and Hildenbrand, 1964 | RDSH |
| 10.5 | EI | Chupka, Berkowitz, et al., 1959 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]
Theard and Hildenbrand, 1964
Theard, L.P.; Hildenbrand, D.L.,
Heat of formation of Be2O(g) by mass spectrometry,
J. Chem. Phys., 1964, 41, 3416. [all data]
Chupka, Berkowitz, et al., 1959
Chupka, W.A.; Berkowitz, J.; Giese, C.F.,
Vaporization of beryllium oxide and its reaction with tungsten,
J. Chem. Phys., 1959, 30, 827. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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