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The structures of SrZrO 3 have been studied in fine temperature steps, from room temperature to 1230 • C, by very high resolution neutron powder diffraction. It has been concluded that SrZrO 3 , orthorhombic in space group Pnma at room temperature, changes by a continuous transition to a pseudo-tetragonal structure in Imma at about 750 • C, then by a discontinuous transformation to tetragonal I4/mcm at about 840 • C, and finally, continuously, to cubic at 1070 • C. The sequence of structures is rationalised by reference to a recent group theoretical analysis (Howard C J and Stokes H T 1998 Acta Crystallogr. B 54 782).

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