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Cation Distribution and Interatomic Interactions in Oxides with Heterovalent Isomorphism: III. Complex Aluminates LnCaAlO4 (Ln = Y, La, Nd, Gd, Ho, Er, Yb)

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Abstract

The heterovalent isomorphism of Ln3++ and Ca2 + cations in stoichiometric LnCaAlO4 oxides was studied. The X-ray diffractometry of the intensity of Laue background modulations revealed a positive short-range order in Ln3 + and Ca2 + distribution over points of one structural site common for both ions, which results in formation of stable Ln3+-Ca2+ couples in adjacent nine-coordinate oxygen polyhedra. The degree of order and the interchange energy estimated in the quasichemical approximation depend both on the effective cationic charges and on the number of unpaired f electrons of the lanthanide atom.

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  1. St. Petersburg State University, St. Petersburg, Russia

    Yu. E. Smirnov & I. A. Zvereva

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  1. Yu. E. Smirnov
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  2. I. A. Zvereva
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Smirnov, Y.E., Zvereva, I.A. Cation Distribution and Interatomic Interactions in Oxides with Heterovalent Isomorphism: III. Complex Aluminates LnCaAlO4 (Ln = Y, La, Nd, Gd, Ho, Er, Yb). Russian Journal of General Chemistry 71, 845–852 (2001). https://doi.org/10.1023/A:1012310930254

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