Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO.sub.3./sub..

Tkach, A.; Almeida, A.; Moreira, J.A.; Correia, T.M.; Chaves, M. R.; Okhay, O.; Vilarinho, P. M.; Gregora, Ivan; Petzelt, Jan

doi:https://dx.doi.org/10.1063/1.3549181

Number of the records: 1

Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO.sub.3./sub..

1.

SYSNO ASEP	0359471
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO₃.
Author(s)	Tkach, A. (PT) Almeida, A. (PT) Moreira, J.A. (PT) Correia, T.M. (PT) Chaves, M. R. (PT) Okhay, O. (PT) Vilarinho, P. M. (PT) Gregora, Ivan (FZU-D)_{RID, ORCID} Petzelt, Jan (FZU-D)_{RID, ORCID, SAI}
Source Title	Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951 Roč. 98, č. 5 (2011), "052903-1"-"052903-2"
Number of pages	2 s.
Language	eng - English
Country	US - United States
Keywords	strontium titanate ; doping ; phase transition ; Raman spectroscopy
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	KAN301370701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000286988400050
DOI	10.1063/1.3549181
Annotation	The effect of Sr vacancies on the behavior of strontium titanate with trivalent dopants (La, Gd, Y) substituting Sr2+ ions is reported. A remarkable shift of the antiferrodistortive transition temperature Ta is revealed by Raman spectroscopy for low content of dopant. A unique linear dependence of Ta on 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 Sr2+ radius, which explains the unexpected increase of lattice parameter with increasing Bi content in (Sr,Bi)TiO₃.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2012

Number of the records: 1