X-Ray Crystal Structure Analysis of Low Temperature Phase of SrTiO₃

Abstract

The crystal structure analysis of the low temperature phase of SrTiO 3 has been made at 77 K using the method of X-ray oscillation photograph. The space group is determined as I4/mcm and the rotational shift of oxygen octahedra with respect to Sr ion frame is by 1.6°; this is slightly larger than those estimated from a previous ESR experiment, neutron diffraction study and from X-ray lattice parameter measurement. Observed temperature parameters are in reasonable agreement with previously reported ones estimated from a rigid shell model.