Compression effect on structure of the Li-stabilized high-temperature phase of Mn3(VO4)2 with composition Li0.2Mn2.9(VO4)2 - Raman spectroscopic and X-ray diffraction investigations

摘要: Abstract Tetragonal Mn3(VO4)2 is a metastable high temperature phase of showing unusual coordination Mn atoms. A nominal Li-substitution helps to stabilize the tetragonal modification. We report room compression Li-stabilized high-temperature with composition Li0.2Mn2.9(VO4)2 studied by in-situ Raman spectroscopy and synchrotron X-ray diffraction up pressures 20 26.5 GPa respectively. suggests onset structural transition at around 10 GPa which completes above 13 GPa. also suggested first order 10 GPa, coexistence range two phases High pressure found be different from known thermodynamically stable orthorhombic structure Mn3(VO4)2. The equation state data ambient has been obtained. Anisotropic observed c-axis being more compressible than a-axis. Using experimental bulk modulus, mode Gruneisen parameters for frequencies have On release, could retrieved.