Oxygen-deficient SrTiO3−x, x = 0.28, 0.17, and 0.08. Crystal growth, crystal structure, magnetic, and transport properties

The grossly nonstoichiometric perovskites SrTiO3−x with x = 0.28, 0.17, and 0.08 were prepared from a reaction of Sr2TiO4, TiO, and TiO2 at 1500°C. For x = 0.28 relatively large single crystals were obtained. Also for this sample the crystal symmetry was found to depend on the rate of cooling from the reaction temperature and the annealing conditions. Rapidly cooled samples are tetragonal a = 3.9177(3) Å, c = 3.8878(5) Å. Samples annealed in …