X-Ray Study on the Successive Phase Transitions of K_2CoCl_4

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The structural p hase transition of K.CoC1. is investigated by naeans of X-ray scattering. The transition temperatures are 558 K, 454 K and 142 K. With decreasing temperature, the symmetry of the crystal changes as follows: phase I, normal (PmcnJ', phaseII, incommensurate [g=(1/3-d)c'l; phase III, commensurate fP2,cn, q=c'733;and phase IV, commensurate [C1cl, q=a " 72A-b" ' /2-F-C'/31. Here the reciprocalvectors refer to the normal phase. In a narrow temperature raatge just above 142 K,the superreflection at (5 / 2 3 / 2 O) splits into two difl'use peaks. 'the general feature ofthe successive transitions is very similar to K.ZnCl,.
社団法人日本物理学会の論文
1990-10-15