Abstract
An analysis of experimental data on the temperature dependence of the crystal lattice parameters of lead orthophosphate Pb3(PO4)2 shows that, within one (ferro-and paraelastic) phase, the unit cell parameter c is linearly related to the other lattice parameters. The bending of this linear dependence corresponds to a c value in the vicinity of a phase transition. An additional bending on the b versus c plots for the ferroelastic phase of lead orthophosphate is revealed, which is probably indicative of a second phase transition in the region of 90–120°C. A linear relationship between crystal lattice parameters has been also found in some other ferroelastic and ferroelectric crystals.
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