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Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3.
- Source :
- Applied Physics Letters; 1/31/2011, Vol. 98 Issue 5, p052903, 3p
- Publication Year :
- 2011
-
Abstract
- The effect of Sr vacancies on the behavior of strontium titanate with trivalent dopants (La<superscript>3+</superscript>, Gd<superscript>3+</superscript>, and Y<superscript>3+</superscript>) substituting Sr<superscript>2+</superscript> ions is reported. A remarkable shift of the antiferrodistortive transition temperature T<subscript>a</subscript> is revealed by Raman spectroscopy for just a small content of dopant. It is shown that a unique linear dependence of T<subscript>a</subscript> versus tolerance factor is obtained when Sr-vacancies are taken into account. A vacancy size value of ∼1.54 Å is estimated, which is ∼7% larger than Sr<superscript>2+</superscript> radius. This size difference enables explaining the unexpected increase of lattice parameter with increasing Bi<superscript>3+</superscript> content in Sr<subscript>1-1.5x</subscript>Bi<subscript>x</subscript>TiO<subscript>3</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 98
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 57822869
- Full Text :
- https://doi.org/10.1063/1.3549181