Dimanganese Phosphide, Mn₂P: Heat Capacity from 5 to 350 K, Magnetic Entropy, and Thermodynamic Functions to 1300 K

Author

Fernande Grandjean, Missouri University of Science and TechnologyFollow
Darrell W. Osborne
William G. Lyon
Howard E. Flotow

Abstract

The heat capacity of a sample of Mn₂P was determined in the temperature range 5 to 350 K by aneroid adiabatic calorimetry. A small peak in the heat capacity correlated with the antiferromagnetic ordering of the compound was found at (102.5 ± 0.5) K. The associated magnetic entropy was calculated to be (9.43 ± 0.52) J K^-1 mol^-1. The heat capacity at constant pressure C_p ^o(298,15 K), the entropy S^o(298.15 K), the enthalpy {H^o(298.15 K) - H^o(0)}, and the function {G^o(298.15 K) - H^o(0)} 298.15 K were found to be (73.54 ± 0.22) J K^-1 mol^-1, (91.01 ± 0.27) J K^-1 mol^-1, (14037 ± 42) J mol^-1, and -(43.93 ± 0.13) J K^-1 mol^-1, respectively. Values of these functions at selected temperatures up to 1300 K are presented in tabular form. The coefficient γ for the contribution of the conduction electrons to the heat capacity (γT) was found to be (23.7 ± 1.6) mJ K^-2 mol^-1.

Recommended Citation

F. Grandjean et al., "Dimanganese Phosphide, Mn₂P: Heat Capacity from 5 to 350 K, Magnetic Entropy, and Thermodynamic Functions to 1300 K," Journal of Chemical Thermodynamics, vol. 9, no. 6, pp. 549 - 559, Elsevier, Jun 1977.

The definitive version is available at https://doi.org/10.1016/0021-9614(77)90159-8

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0021-9614

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1977 Elsevier, All rights reserved.

Publication Date

01 Jun 1977