magnesium diboride
- Formula: B2Mg
- Molecular weight: 45.927
- CAS Registry Number: 12007-25-9
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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 (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. - 2000. |
|---|---|
| A | 56.12501 |
| B | 7.116315 |
| C | 12.69530 |
| D | -3.343091 |
| E | -1.024147 |
| F | -112.5734 |
| G | 95.43537 |
| H | -91.96390 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1965 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 298. | 47.75 | 35.91 | 36.00 | -0.03 |
| 300. | 47.93 | 36.23 | 36.00 | 0.07 |
| 400. | 54.39 | 51.00 | 37.95 | 5.22 |
| 500. | 58.34 | 63.59 | 41.85 | 10.87 |
| 600. | 61.40 | 74.50 | 46.40 | 16.86 |
| 700. | 64.09 | 84.17 | 51.12 | 23.14 |
| 800. | 66.63 | 92.90 | 55.81 | 29.67 |
| 900. | 69.11 | 100.9 | 60.38 | 36.46 |
| 1000. | 71.57 | 108.3 | 64.80 | 43.49 |
| 1100. | 74.02 | 115.2 | 69.08 | 50.77 |
| 1200. | 76.46 | 121.8 | 73.20 | 58.30 |
| 1300. | 78.88 | 128.0 | 77.18 | 66.06 |
| 1400. | 81.27 | 133.9 | 81.02 | 74.07 |
| 1500. | 83.63 | 139.6 | 84.74 | 82.32 |
| 1600. | 85.92 | 145.1 | 88.34 | 90.80 |
| 1700. | 88.13 | 150.4 | 91.83 | 99.50 |
| 1800. | 90.25 | 155.5 | 95.23 | 108.4 |
| 1900. | 92.26 | 160.4 | 98.53 | 117.5 |
| 2000. | 94.14 | 165.2 | 101.7 | 126.9 |
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
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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