Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Tkach, A (Author) Other; Almeida, A (Author) FCUP; Agostinho A Moreira (Author) FCUP; Correia, TM (Author) Other; Chaves, MR (Author) Other; Okhay, O (Author) Other; Vilarinho, PM (Author) Other; Gregora, I (Author) Other; Petzelt, J (Author) Other

Journal

Title: Applied Physics Letters

Vol. 98

Final page: 052903

ISSN: 0003-6951

Publisher: American Institute of Physics

Indexing

ISI Web of Knowledge - 31 Citations

ISI Web of Science

Scopus - 32 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-002-VR4

DOI: 10.1063/1.3549181

Abstract (EN): 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]

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3