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SrMoO4 was studied under compression up to 25 GPa by angle-dispersive x-raydiffraction. A phase transition was observed from the scheelite-structuredambient phase to a monoclinic fergusonite phase at 12.2(9) GPa with cellparameters a = 5.265(9) A, b = 11.191(9) A, c = 5.195 (5) A, and beta = 90.9, Z= 4 at 13.1 GPa. There is no significant volume collapse at the phasetransition. No additional phase transitions were observed and on release ofpressure the initial phase is recovered, implying that the observed structuralmodifications are reversible. The reported transition appeared to be aferroelastic second-order transformation producing a structure that is amonoclinic distortion of the low-pressure phase and was previously observed incompounds isostructural to SrMoO4. A possible mechanism for the transition isproposed and its character is discussed in terms of the present data and theLandau theory. Finally, the EOS is reported and the anisotropic compressibilityof the studied crystal is discussed in terms of the compression of the Sr-O andMo-O bonds.

High-pressure x-ray diffraction study of SrMoO4 and pressure-induced structural changes