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short communications
The lattice constants of Tb2(MoO4)3 have been measured by X-ray diffraction in the temperature range 296 to 505 K, and by dilatometry in the range 296 to 1015 K. The coefficients of thermal expansion for both orthorhombic and tetragonal phases are presented. The c-axis lattice constant in the paraelectric-paraelastic tetragonal phase above the transition temperature Tc varies by less than 2 parts in 104, with a shallow minimum at 1.23Tc. The temperature dependence of the spontaneous strain is shown to follow that of the spontaneous polarization very closely, confirming their linear proportionality.