THERMODYNAMIC PROPERTIES OF MNMOO4 AND MN2MO3O8

被引：26

作者：

BESSERGENEV, VG

KOVALEVSKAYA, YA

PAUKOV, IE

STARIKOV, MA

OPPERMANN, H

REICHELT, W

机构：

[1] ACAD SCI USSR,INST INORGAN CHEM,PROSP AC LAVRENTIEVA 3,NOVOSIBIRSK 630090,USSR

[2] TECH UNIV DRESDEN,DEPT CHEM,O-8027 DRESDEN,GERMANY

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1992年 / 24卷 / 01期

关键词：

D O I：

10.1016/S0021-9614(05)80259-9

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The temperature dependencies of the heat capacity of MnMoO4 and Mn2Mo3O8 have been investigated from 5 K to 300 K with a vacuum-jacketed adiabatic calorimeter. The thermodynamic functions have been calculated on the basis of experimental results on Cp,m(T). The standard values at the temperature 298.15 K for MnMoO4 are: Cp,m = 13.924 · R; SSom = 17.992 · R; Hom(T) - Hom(0) = 2556.7 · R · K; and Φom = 9.417 · R. For Mn2Mo3O8 the same quantities are equal to 29.575 · R, 30.609 · R, 4797.7 · R · K and 14.517 · R, respectively. The λ-anomalies connected with the magnetic-ordering phase transitions were observed and studied in detail. The phase-transition temperatures for MnMoO4 and Mn2Mo3O8 correspond to 10.5 K and 39.44 K, respectively. A sharp increase of the thermal-relaxation time has been revealed in MnMoO4 at T < 10 K. The probable causes of this phenomenon are discussed. © 1992 Academic Press Limited All rights reserved.

引用

页码：85 / 98

页数：14

共 17 条

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