High pressure X-ray diffraction study of SrMnO3 perovskite

Using a diamond anvil cell device and synchrotron radiation, the in-situ high-pressure structure of SrMnO 3 has been investigated. At pressure up to 28.6 GPa, no pressure-induced phase transition is observed. The lattice parameters as a function of pressure is reported, and the relationship of the axial compression coefficients is β a 〉 β c . The isothermal bulk modulus K 298 =266（4） GPa is also obtained by fitting the pressure- volume data using the Murnaghan equation of state.