材料期刊网

The structure changes and electrical properties in Ca4Mn3O10 under high pressure at room temperature have been studied using energy-dispersive x-ray diffraction with synchrotron radiation and resistance and capacitance measurements. A phase transition from an orthorhombic to a tetragonal phase occurred during increasing pressure to above 19.3 GPa. The equation of state of Ca4Mn3O10 was obtained from the V/V-0-P relationship. The bulk modulus B-0 and its first-order derivative B-0' of Ca4Mn3O10 were calculated based on the Birch-Murnaghan equation. (C) 2002 American Institute of Physics.