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2008•Russian Geology and GeophysicsRequires access

The thermal behavior of secondary analcime as leucite derivate and its structural interpretation

Yurii V. Seryotkin, V. V. Bakakin

Open publisher page 8 citations

Abstract

Abstract Two samples of Na-substituted leucite with Na/(Na + K) = 0.74 (1) and 0.89 (2) were studied by dilatometry, thermogravimetry, and X-ray powder diffraction method. Sample 1 is a mixture of analcime and leucite, and sample 2 consists of analcime alone. The miscibility of K+ and Na+ in hydrated analcime is estimated at 15–20 at.% K+. The thermal behavior of the samples varies depending on their Na/K ratio. Dehydrated Na,K-analcime undergoes a trigonal distortion; its structural model is proposed. The earlier recognized difference in the thermal behavior of primary and secondary (obtained from leucite through K+–Na+ exchange) analcimes might be due to the influence of unsubstituted K+.

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Abstract Two samples of Na-substituted leucite with Na/(Na + K) = 0.74 (1) and 0.89 (2) were studied by dilatometry, thermogravimetry, and X-ray powder diffraction method. Sample 1 is a mixture of analcime and leucite, and sample 2 consists of analcime alone. The miscibility of K+ and Na+ in hydrated analcime is estimated at 15–20 at.% K+. The thermal behavior of the samples varies depending on their Na/K ratio. Dehydrated Na,K-analcime undergoes a trigonal distortion; its structural model is proposed. The earlier recognized difference in the thermal behavior of primary and secondary (obtained from leucite through K+–Na+ exchange) analcimes might be due to the influence of unsubstituted K+.

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Available abstract

Abstract Two samples of Na-substituted leucite with Na/(Na + K) = 0.74 (1) and 0.89 (2) were studied by dilatometry, thermogravimetry, and X-ray powder diffraction method. Sample 1 is a mixture of analcime and leucite, and sample 2 consists of analcime alone. The miscibility of K+ and Na+ in hydrated analcime is estimated at 15–20 at.% K+. The thermal behavior of the samples varies depending on their Na/K ratio. Dehydrated Na,K-analcime undergoes a trigonal distortion; its structural model is proposed. The earlier recognized difference in the thermal behavior of primary and secondary (obtained from leucite through K+–Na+ exchange) analcimes might be due to the influence of unsubstituted K+.

Key concepts: Leucite, Analcime, Materials science, Mineralogy, Thermal expansion, Crystallography, Geology, Chemistry

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