The magnetic susceptibilities of powdered specimens of Cu(HCO2)2·4H2O, Cu(HCO2)2·2H2O, and Mn(HCO2)2·2H2O have been measured by an audio‐frequency mutual‐inductance method between 1.3° and 4.2°K, and from 14° to 20°K. At hydrogen temperatures Cu(HCO2)2·2H2O and Mn(HCO2)2·2H2O exhibit Curie—Weiss behavior which, however, breaks down significantly in the helium region. The susceptibility of Cu(HCO2)2·4H2O rises to a pronounced peak at 16.8°K and is essentially constant below 4.2°K. The susceptibilities of single‐crystal Cu(HCO2)2·4H2O were measured along the three monoclinic axes in the same temperature intervals. χc and χb show sharp maxima at 16.8°, and are much larger in magnitude than χa. The possibility of this salt becoming weakly ferromagnetic below 16.8°K is considered, as is the unusual indirect‐exchange coupling of Cu++ moments via formate groups.
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1 June 1963
Research Article|
June 01 1963
Low‐Temperature Magnetic Susceptibilities of Some Hydrated Formates of Cu++ and Mn++
J. Chem. Phys. 38, 2652–2657 (1963)
Article history
Received:
November 26 1962
Citation
R. B. FlippenS. A. Friedberg; Low‐Temperature Magnetic Susceptibilities of Some Hydrated Formates of Cu++ and Mn++. J. Chem. Phys. 1 June 1963; 38 (11): 2652–2657. https://doi.org/10.1063/1.1733567
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