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Proceedings Paper

Synthesis and electrical properties of potassium-substituted hydrosodalites
Author(s): Arvo Mere; Dan Hyvonen; Ivo Heinmaa; Tonu Ruus
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Paper Abstract

The synthesis of potassium substituted basic sodalites (formula available in paper) were performed. The XRD and FTIR measurements confirmed one phase results of the synthesis, but the number of water molecules in (beta) -cages was different from the expected values. The ionic radius of potassium is approximately 30% larger than radius of the sodium ion. The lattice constants of potassium substituted sodalites are about 3.6% larger than sodalite lattice constants. The thermally stimulated depolarization current technique was applied to determine dielectric relaxation process in the potassium substituted basic sodalites. We assume that all generated dipole momentum during the TSDC test belongs mainly to the potassium ions which have various possible localization positions in the (beta) -cage. The basic (formula available in paper) have similar TSDC peak positions at 335 K, but different activation energies of dielectric relaxation process. The activation energy of potassium substituted basic sodalites is larger than activation energy in basic Na sodalite which is explained by higher volume occupied by the potassium ions in the (beta) -cage. In case of the potassium substituted nonbasic sodalite the activation energy of dielectric relaxation process was about two times lower than the activation energy of dielectric relaxation process in the Na nonbasic sodalite. This fact is explained by lower number than 4 of the water molecules in (beta) -cage.

Paper Details

Date Published: 8 March 2001
PDF: 6 pages
Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001); doi: 10.1117/12.417615
Show Author Affiliations
Arvo Mere, Tallinn Technical Univ. (Estonia)
Dan Hyvonen, Tallinn Technical Univ. (Estonia)
Ivo Heinmaa, National Institute of Chemical Physics and Biophysics (Estonia)
Tonu Ruus, Tallinn Technical Univ. (Estonia)

Published in SPIE Proceedings Vol. 4318:
Smart Optical Inorganic Structures and Devices
Steponas P. Asmontas; Jonas Gradauskas, Editor(s)

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