Successive Phase Transitions in {N(CH3)4}2CuCl4
1980 年 49 巻 4 号 p. 1405-1412
詳細
1980 年 49 巻 4 号 p. 1405-1412
Successive phase transitions in {N(CH3)4}2CuCl4 single crystal were studied by the measurements of the angle between two extinction positions, thermal expansions, dielectric constants and ultrasound velocities, and also by the weissenberg photographs. It has turned out that {N(CH3)4}2CuCl4 undergoes the phase transitions successively from the prototypic phase (Pmcn), to the incommensurate phase, to the ferroelastic commensurate monoclinic phase (P121/c1) and then to another monoclinic phase (P1121/n) at T1=24°C, T2=18°C (on heating) and T3=−10°C, respectively. The phase transition sequence of {N(CH3)4}2CuCl4, including the incommensurate-commensurate (ferroelastic) transition, is discussed in terms of the Landau-type free energy.
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