Temperature dependence of lattice parameters and spontaneous strain in Pb 3 (PO 4 ) 2
- 1 December 1979
- journal article
- research article
- Published by Taylor & Francis in Phase Transitions
- Vol. 1 (2) , 143-153
- https://doi.org/10.1080/01411597908213197
Abstract
Precise measurements of the lattice parameters of Pb3(PO4)2 as a function of temperature are presented, from which the spontaneous strain and its tensor components are calculated. The ferroelastic transition is shown to be of first order. Mean-field theory is shown to describe the experimental behaviour of the material, with a crossover, at about 160°C, from a critical to a first-order regime. This result is interpreted on the basis of the temperature dependence of elastic constant c22.Keywords
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