Using a diamond anvil cell device and synchrotron radiation,the in-situ high-pressure structure of CaMnO3 has been investigated.In the pressure up to 36.5 GPa,no pressure-induced phase transition is observed.The pressure dependence on the lattice parameters of CaMnO3 is reported,and the relationship of the axial compression coefficients is βa > βc > βb.The isothermal bulk modulus K298=224(25) GPa is also obtained by fitting the pressure-volume data using the Murnaghan equation of state.
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.
