DOI

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 ordering 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 ordering 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.

Язык оригиналаанглийский
Страницы (с-по)845-852
Число страниц8
ЖурналRussian Journal of General Chemistry
Том71
Номер выпуска6
DOI
СостояниеОпубликовано - 2001

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ID: 87767946