Etude comparative des structures type K<sub>4</sub>NiF<sub>4</sub> et pérovskite par la méthode des invariants期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Etude comparative des structures type K₄NiF₄ et pérovskite par la méthode des invariants

Authors:	Paul Poix

Institution:	Department science des matériaux, Ecole Nationale Supérieure de Chimie de Strasbourg, 1, rue Blaise Pascal, B.P. 296/R8, 67008 Strasbourg Cedex, France

Abstract:	The study of K₂NiF₄ and perovskite structure type by the “method of invariants” leads to the relationship: $(A-X)_{9} 2^{12} ? (A-X)_{12} = constant$ , where (A-X)₉ and (A-X)₁₂ are the invariant values associated with cation A in coordination number 9 and 12. In the case where A = K⁺ and X = F^?, we propose the relationship: $(K^{+} ?F)_{R} = 2.832 R^{111.4}$ where R is the coordination number.

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