J. Dojcilovic et al., STRUCTURAL PHASE-TRANSITIONS IN CO(II) AND NI(II) DIPHOSPHATES IN THETEMPERATURE-RANGE 290-1000-K, Materials chemistry and physics, 39(1), 1994, pp. 76-79
This paper presents a study of the temperature dependence of the diele
ctric permittivity, electric resistivity and magnetic susceptibility o
f the diphosphate M2P2O7, where M = Co(II) and Ni(II). The study, whic
h was carried out in the temperature range 290-1000 K, indicated that
both compounds sustain three phase transitions each. The existing lite
rature offers a description of one phase transition for both compounds
(alpha --> beta).