Ammonium hydrogen oxalate hemihydrate


Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
solid,1 bar189.24J/mol*KN/AFukai, Matsuo, et al., 1989 
solid,1 bar189.24J/mol*KN/AFukai, Matsuo, et al., 1989 

Constant pressure heat capacity of solid

Cp,solid (J/mol*K) Temperature (K) Reference Comment
166.91298.15Fukai, Matsuo, et al., 1989T = 13 to 300 K.
166.91298.15Fukai, Matsuo, et al., 1989T = 13 to 300 K.

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.730145.4crystaline, IIcrystaline, IFukai, Matsuo, et al., 1990 
0.00037145.4crystaline, IIcrystaline, IFukai, Matsuo, et al., 1989 
0.00037145.4crystaline, IIcrystaline, IFukai, Matsuo, et al., 1989 

Entropy of phase transition

ΔStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
6.01145.4crystaline, IIcrystaline, IFukai, Matsuo, et al., 1990 
3.01145.4crystaline, II, Ordercrystaline, I, disorder transitionFukai, Matsuo, et al., 1989 
3.01145.4crystaline, II, Ordercrystaline, I, disorder transitionFukai, Matsuo, et al., 1989 

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Fukai, Matsuo, et al., 1989
Fukai, M.; Matsuo, T.; Suga, H., Calorimetric study of phase transitions in ammonium hydrogen oxalate hemihydrate and its deuterated compound, J. Phys. Chem. Solids, 1989, 50, 743-751. [all data]

Fukai, Matsuo, et al., 1990
Fukai, M.; Matsuo, T.; Suga, H., Low temperature heat capacities of ammonium hydrogen oxalate hemihydrate and its deuterate analogue, Ferroelectrics, 1990, 108, 367-372. [all data]


Notes

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