再论K2Cd2xMn2（1-x）（SO4）3 Langbeinite的“禁畴”结构和孤立点
Once More About the "Forbidden" Domain Structure and the Isolated Point in K2Cd2xMn2(1-x)(SO4)3 Langbeinites
摘要：
本文用偏光显微镜研究了无水钾镁矾晶体K_2Cd_2xMn_2（1-x）（SO_4）_3（x=0.5，0.7和0.9）的畴结构。结果表明，铁弹性无水钾镁矾中的畴壁分离了对映取向态。这些取向状态出现在与假设的相变相关的具有对称性23的相位中。在具有对称性222的相位中，这些畴壁被转换为具有相反的对映体符号的分离铁弹畴的畴壁。结果表明，一个对映结构域只能通过一层厚的具有对称性的母相转变为另一个对映结构域。体积热膨胀的结果。结果表明，K_2Cd_2xMn_2（1-x）（SO_4）_3固溶体x，T相图上的孤立点对应于浓度x=0.6。
英文摘要：
The domain structure in K2Cd2xMn2(1-x)(SO4)3 (x=0.5, 0.7 and 0.9) langbeinite crystals is studied with the aid of optical polarization microscopy. It is shown that the domain walls in ferro-elastic langbeinites separate enantiomorphous orientation states. These orientation states appear in the phase with the symmetry 23 in connection with the hypothetic phase transition . In the phase with the symmetry 222, these domain walls are transformed to those separating ferroelastic domains with the opposite signs of enantiomorphism. It is revealed that one enantiomorphous domain can only transform to the other via a thick layer of the parent phase with symmetry. The results for the volume thermal expansion are presented. It is shown that the isolated point at the x,T-phase diagram of K2Cd2xMn2(1-x)(SO4)3 solid solutions corresponds to the concentration x=0.6.
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