Tantalum dioxide
- Formula: O2Ta
- Molecular weight: 212.9467
- IUPAC Standard InChI: InChI=1S/2O.Ta/q2*-2;+4
- IUPAC Standard InChIKey: DPWBZNOQZSTFQV-UHFFFAOYSA-N
- CAS Registry Number: 12036-14-5
- Chemical structure:
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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 | -48.000 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1973 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 66.993 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1973 |
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) | 298. to 1200. | 1200. to 6000. |
|---|---|---|
| A | 7.802912 | 14.66410 |
| B | 13.84110 | -0.904698 |
| C | -11.91960 | 0.335477 |
| D | 3.633901 | -0.028129 |
| E | -0.040420 | -0.741735 |
| F | -50.97949 | -54.34001 |
| G | 72.57980 | 82.06671 |
| H | -48.00000 | -48.00000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1973 | Data last reviewed in December, 1973 |
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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 8.5 ± 0.5 | EI | Smoes, Drowart, et al., 1976 | LLK |
| 9. ± 0.5 | EI | Inghram, Chupka, et al., 1957 | 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]
Smoes, Drowart, et al., 1976
Smoes, S.; Drowart, J.; Myers, C.E.,
Determination of the atomization energies of the molecules TaO(g) TaO2(g) by the mass-spectrometric Knudsen-cell method,
J. Chem. Thermodyn., 1976, 8, 225. [all data]
Inghram, Chupka, et al., 1957
Inghram, M.G.; Chupka, W.A.; Berkowitz, J.,
Thermodynamics of the Ta-O system: the dissociation energies of TaO and TaO2,
J. Chem. Phys., 1957, 27, 569. [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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