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niobium dioxide


Solid Phase Heat Capacity (Shomate Equation)

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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. - 1090.1090. - 1200.1200. - 2175.
A 66.4998042.5443083.05240
B -11.2606072.408600.000005
C 49.61520-37.31880-0.000009
D -16.466306.3549900.000003
E -0.8583158.939621-0.000006
F -817.5700-799.2920-821.4040
G 131.457091.33660144.5680
H -794.9600-794.9600-794.9600
ReferenceChase, 1998Chase, 1998Chase, 1998
Comment Data last reviewed in December, 1973 Data last reviewed in December, 1973 Data last reviewed in December, 1973
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
298.57.4554.4854.51-0.01
300.57.6154.8754.510.11
400.63.5272.3256.856.19
500.67.7886.9661.4512.76
600.71.6699.6766.7819.73
700.75.53111.072.3027.09
800.79.47121.377.8034.84
900.83.49130.983.1742.99
1000.87.53139.988.4051.54
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
1090.92.89150.792.9562.99
1100.92.88151.693.4863.92
1200.92.89159.798.6773.20
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
1200.83.05159.798.6973.22
1300.83.05166.4103.681.52
1400.83.05172.5108.389.83
1500.83.05178.2112.898.13
1600.83.05183.6117.1106.4
1700.83.05188.6121.1114.7
1800.83.05193.4125.0123.1
1900.83.05197.9128.7131.4
2000.83.05202.1132.3139.7
2100.83.05206.2135.7148.0

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