Calorimetric study of MgZn2 and Mg2Zn11

Masao Morishita; Koichiro Koyama

doi:10.1515/ijmr-2003-0176

Published by De Gruyter February 7, 2022

Calorimetric study of MgZn₂ and Mg₂Zn₁₁

Masao Morishita and Koichiro Koyama

From the journal International Journal of Materials Research

https://doi.org/10.1515/ijmr-2003-0176

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Abstract

The thermodynamic properties of MgZn₂ and Mg₂Zn₁₁ were investigated by calorimetry. The standard entropies of formation at 298 K, ΔfS298° were determined from measuring the heat capacities, C_p, from near absolute zero (2 K) to 390 K by the relaxation method. The standard enthalpies of formation at 298 K, ΔfH298° were determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energies of formation at 298 K, ΔfG298° were determined from these data. The electronic contribution to the heat capacities of MgZn₂ and M₂Zn₁₁ were found to be similar to pure Zn, indicating that the valence electrons of Mg are trapped by the density of states for Zn in the vicinity of the Fermi level.

Keywords: MgZn2; Mg2Zn11; Calorimetry; Heat capacity; Enthalpy of formation; Gibbs energy of formation

Prof. Masao Morishita Department of Materials Science and Chemistry Himeji Institute of Technology 2167 Shosha, Himeji, 671-2201 Japan Tel.: +81 792 67 4915 Fax: +81 792 66 8868

The authors wish to express their thanks to Mr. K.Yagi, bachelor student of Himeji Institute of Technology, for the cooperative work of the experiment.

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Received: 2003-01-08

Published Online: 2022-02-07

Calorimetric study of MgZn₂ and Mg₂Zn₁₁

Abstract

References

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