Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3
authors Tkach, A; Almeida, A; Moreira, JA; Correia, TM; Chaves, MR; Okhay, O; Vilarinho, PM; Gregora, I; Petzelt, J
nationality International
journal APPLIED PHYSICS LETTERS
keywords PHASE-TRANSITION
abstract The effect of Sr vacancies on the behavior of strontium titanate with trivalent dopants (La3+, Gd3+, and Y3+) substituting Sr2+ ions is reported. A remarkable shift of the antiferrodistortive transition temperature T-a is revealed by Raman spectroscopy for just a small content of dopant. It is shown that a unique linear dependence of Ta versus tolerance factor is obtained when Sr-vacancies are taken into account. A vacancy size value of similar to 1.54 angstrom is estimated, which is similar to 7% larger than Sr2+ radius. This size difference enables explaining the unexpected increase of lattice parameter with increasing Bi3+ content in Sr1-1.5xBixTiO3. (C) 2011 American Institute of Physics. [doi:10.1063/1.3549181]
publisher AMER INST PHYSICS
issn 0003-6951
year published 2011
volume 98
issue 5
digital object identifier (doi) 10.1063/1.3549181
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000286988400050
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journal impact factor 3.597
5 year journal impact factor 3.4
category normalized journal impact factor percentile 76.299
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