Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3
作者： A. Tkach , A. Almeida , J. Agostinho Moreira , T. M. Correia , M. R. Chaves
DOI: 10.1063/1.3549181
关键词: Doping 、 Inorganic chemistry 、 Raman spectroscopy 、 Strontium 、 Strontium titanate 、 Lattice constant 、 Transition temperature 、 Dopant 、 Vacancy defect 、 Materials science 、 Analytical chemistry
摘要: The effect of Sr vacancies on the behavior strontium titanate with trivalent dopants (La3+, Gd3+, and Y3+) substituting Sr2+ ions is reported. A remarkable shift antiferrodistortive transition temperature Ta revealed by Raman spectroscopy for just a small content dopant. It shown that unique linear dependence versus tolerance factor obtained when Sr-vacancies are taken into account. vacancy size value ∼1.54 A estimated, which ∼7% larger than radius. This difference enables explaining unexpected increase lattice parameter increasing Bi3+ in Sr1−1.5xBixTiO3.
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