Abstract
The systematic experimental and theoretical investigations of rare-earth (RE) ion contribution to the temperature dependencies of the Young moduli and lattice parameters were performed for RE phosphates RPO 4 (R = Y, Tb-Yb). An anomalous behavior of the Young moduli and lattice parameters for the investigated phosphates in comparison with YPO 4 and a strong softening of Young's moduli for TbPO 4 and TmPO 4 were discovered. It is shown that anomalies of Young's moduli are well described by the temperature dependencies of strain susceptibilities of RE ions calculated utilizing available crystal-field parameters. The thermal expansion anomalies can be described in terms of temperature dependencies of quadrupole moments. Values of magnetoelastic coefficients were estimated. For Tb and Tm phosphates, the strong softening of Young's moduli is ascribed to the correlation enhancement of relevant strain susceptibilities.
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