Abstract
Susceptibility and magnetization measurements on powdered samples of NH 4CoF 3 are presented. The compound has the simple cubic perovskite structure at room temperature. At T c = 124.5 ± 0.1K a structural transition to a pseudo-tetragonal symmetry occurs which is accompanied by the onset of long-range antiferromagnetic order. Evidence for the presence of a small weak-ferromagnetic moment is found. The susceptibility in the paramagnetic regime is compared with published data on KCoF 3, RbCoF 3 and TlCoF 3. A calculation of the susceptibility, including both the crystal-field contribution and the exchange contribution within the molecular-field approximation, is found to yield reasonable fits to these data in the range T ⪆ 200 K.
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