Structural Phase Transitions of Spinel Compounds by High-Resolution Powder Diffraction

Abstract

High-resolution powder diffractometry is a powerful method to determine the accurate crystal system and crystal structures. Neutron powder diffraction using TOF neutron diffractometer （SuperHRPD） in MLF at J-PARC and X-ray powder diffraction using Debye-Scherrer diffractometer with one-dimensional MYTHEN detector at SPring-8 are introduced. We successfully observed the structural phase transitions accompanied by small crystal distortion in spinel oxide CoV₂O₄ and its substitution system by combination of these measurements and clarify the nature of the phase transition of CoV₂O₄.