Structural investigation of Sr2LiReO6. Evidence for a continuous tetragonal–cubic phase transition

The presence of a continuous and reversible View the MathML sourceFm3¯m–I4/m phase transition in a polycrystalline sample of the ordered double perovskite Sr2LiReO6 is described. The transition that occurs near 300 °C is a consequence of in-phase tilting of the BO6 octahedra. The temperature dependence of both the lattice parameters and the spontaneous strains are consistent with a second order phase transition as would be expected for a soft mode transition.