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The sequence of phase transitions due to octahedral tilting across the Sr(Zr,Ti)O 3 solid solution series has been investigated by resonant ultrasound spectroscopy at high and low temperatures using ceramic samples. The elastic behaviour associated with phase transitions as a function of composition in Sr(Zr,Ti)O 3 at room temperature is proposed to be analogous to that as a function of temperature in what is assumed to be I mma, appear to have stability fields across the full compositional range and both show large dissipation effects, most probably due to twin wall mobility. In contrast, the Zr-rich Pnma phase, which should contain transformation twin walls, is an unexpectedly stiff and non-dissipating material, similar to the high temperature and/or Ti-rich Pm3m phase. In the case of Pnma, this is attributed to coupling between the two order parameters, which could impede relaxation responses to an applied stress. The Pm3m structure is a classically stiff cubic perovskite and no transformation-related dissipation processes are expected.

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