ヘリウムガズ体による高圧下単結晶X線構造解析 -混合原子価錯体Cs_2Au^IAu^<III>X_6の結晶構造- [in Japanese] Single Crystal X-Ray Structure Analysis under High Pressure Using He Gas as a Pressure Transmitting Medium -Crystal Structure of Mixed-Valence Complexes Cs_2Au^IAu^<III>X_6- [in Japanese]
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In this report, a technique of single-crystal X-ray diffraction measurements under high pressures, using a diamond-anvil-cell with helium gas as an inert and hydrostatic pressure-transmitting medium, is introduced. The technique has been applied to three-dimensional halogen-bridged mixed-valence gold complexes, Cs<SUB>2</SUB>Au<SUP>I</SUP>Au<SUP>III</SUP>X<SUB>6</SUB> (X=Cl, I) to investigate the mixed-valence state and the crystal structure under high pressures up to 18 GPa and 7. 5 GPa, respectively. The pressure dependences of the unit cell parameters indicate that structural phase transitions occur from tetragonal to cubic at 12. 5 GPa for the Cl-bridged complex, and from tetragonal to monoclinic at 6. 0 GPa for the I-bridged complex. The Cl-bridged complex in the higher pressure phase has a space group, Pm3m and the cubic Perovskite-type structure.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 8(4), 280-286, 1998-11-01
The Japan Society of High Pressure Science and Technology