Polymorphisme du sulfate de thallium(I), Tl2SO4 |
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| Authors: | M Diot G Lachenal JR Vignalou |
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| Institution: | Laboratoire de Chimie Minérale de l''Institut National des Sciences Appliquées de Lyon, 20 Avenue Albert Einstein, 69621 Villeurbanne France;Laboratoire de Synthèse Minérale, Université Claude Bernard-Lyon I, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex France;Laboratoire de Physico-Chimie Minérale 3, Université Claude Bernard-Lyon I, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex France |
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| Abstract: | X-Ray and DTA techniques were employed to study the thermal and structural characteristics of thallium(I) sulfate. By means of heat treatment, it has been found to evolve successively from a γ-monoclinic phase, through four (β1, β2, β3, β4) orthorhombic phases to an α-trigonal phase. According to the preparation method at room temperature, this compound can be obtained in γ or β1 or β2 form or in a mixture of these three phases. The predominance of one of these three forms and the reversibility of some modifications are strongly influenced by crystal size. |
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