X-Ray Study of the Phase Transitions in K3D(SO4)2 and K3H(SO4)2
X-Ray Study of the Phase Transitions in K3D(SO4)2 and K3H(SO4)2
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K3D(SO4)2 和 K3H(SO4)2 相变的 X 射线研究
DOI：
10.1143/jpsj.60.1972
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发表时间：
1991
影响因子：
1.7
通讯作者：
K. Gesi
中科院分区：
文献类型：
--
作者：
Y. Noda;Y. Watanabe;H. Kasatani;H. Terauchi;K. Gesi
用X射线散射实验研究了K3D(SO4)2的结构相变，在Tc=85K以下观察到新的反射，空间群在Tc以上为A2/a(Z=4)，在Tc以下为P21/a(Z=4)。假设的低温相结构具有反极性特征。还研究了晶格参数与温度的关系，其在T_c以下的反常较小。利用与由德拜近似计算的曲线的偏差来估计序参数的性质。在K3H(SO4)2中的类似实验没有显示出任何相变的证据。
Structural phase transition of K 3 D(SO 4 ) 2 was studied by X-ray scattering experiments, and new reflections were observed below T c =85 K. The space groups are A 2/ a ( Z =4) above T c and P 2 1 / a ( Z =4) below T c . The postulated structure of the low temperature phase has an antipolar character. Temperature dependence of lattice parameters was also investigated, whose anomaly below T c was marginally small. The deviation from the curve calculated by the Debye approximation was utilized to estimate the nature of the order parameter. Similar experiments in K 3 H(SO 4 ) 2 have not shown any evidence of the phase transition.