Pressure-Induced Phase Transitions and Change in Crystal Color in (N(CH3)4)2CuCl4.

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  • Shimomura Susumu
    Department of Physics, Faculty of Science and Technology, Keio University, 3–14–1
  • Fukui Toshiaki
    Hiyoshi, Kohoku–ku, Yokohama 223 Department of Physics, Kwansei–Gakuin University, Nishinomiya 662
  • Terauchi Hikaru
    Hiyoshi, Kohoku–ku, Yokohama 223 Department of Physics, Kwansei–Gakuin University, Nishinomiya 662

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  • Pressure-Induced Phase Transitions and Change in Crystal Color in〔N(CH3)4〕2CuCl4
  • Pressure-Induced Phase Transitions and
  • Pressure-Induced Phase Transitions and Change in Crystal Color in [N(CH<sub><b>3</b></sub>)<sub><b>4</b></sub>]<sub><b>2</b></sub>CuCl<sub><b>4</b></sub>

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X-ray diffraction studies of [N(CH3)4]2CuCl4 single crystals have been carried out under hydrostatic pressure at room temperature.With increasing pressure, phase transitions take place successively, to a monoclinic phase with a unique axis along b (space group, C2h5-P121/c1) at 1.4 GPa, to a monoclinic phase with a unique axis along c (C2h5-P1121/n) at 1.7 GPa, and then to an orthorhombic phase (D24-P212121) at 3.4 GPa. The transition to the highest-pressure phase is accompanied by a discontinuous change in the crystal color from light yellow to dark green. The color change is considered to be a result of a change in CuCl42- anion geometry.

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