Conductivity and dielectric response in the ion-exchange intercalated mono- and double-layer hydrates Cd0.75PS3Na0.5(H2O)y, y = 1, 2

被引:12
作者
Jeevanandam, P [1 ]
Vasudevan, S [1 ]
机构
[1] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India
关键词
D O I
10.1021/jp972945h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hydrated Na ions have been ion-exchange intercalated into the insulating layered cadmium thiophosphate to give Cd0.75PS3Na0.5(H2O)(y). Intercalation occurs with a dilation of the lattice which depends on the extent of hydration of the interlamellar Na ion; for y = 1 the lattice expansion is 2.8 Angstrom, while for y = 2 it is 5.5 Angstrom. The conductivity and dielectric response of Cd0.75PS3Na0.5(H2O)(y), y = 1, 2, have been investigated as a function of frequency and temperature. The electrical behavior of the two compounds is dramatically different. In the y = 2 compound Na ions are mobile and the material is conducting. The dielectric spectrum is featureless, but the electrical modulus, the reciprocal of the complex dielectric permittivity, exhibits a conductivity relaxation. In contrast, when y = 1, the compound is nonconducting, with the dielectric permittivity exhibiting a relaxation. The relaxation times and activation energy are comparable to that of the dielectric relaxation at acoustic frequencies in ice.
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页码:3082 / 3089
页数:8
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