Study of polar relaxation processes in Sr(1-1.5x)LaxTiO3 ceramics by using field-induced thermally stimulated currents

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

Almeida, A (Autor) FCUP; Correia, TM (Autor) Outra; Chaves, MR (Autor) Outra; Vilarinho, PM (Autor) Outra; Kholkin, AL (Autor) Outra; Costa, AM (Autor) Outra

Revista

Título: Journal of the European Ceramic Society

Vol. 27

Páginas: 3701-3703

ISSN: 0955-2219

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-004-DSB

DOI: 10.1016/j.jeurceramsoc.2007.02.021

Abstract (EN): Polar relaxation processes in Lanthanum doped SrTiO3 (STO) ceramics, with general formulae Sr(1-1.5x)LaxTiO3, were studied by undertaking field-induced thermally stimulated currents measurements below room temperature. The experimental results obtained for doped ceramic (x= 0.0133) were analysed by using dipolar and space-charge relaxation thermally stimulated depolarization currents (TSDC) models in order to determine the nature of the relaxation processes involved. Our results reveal the existence of different relaxation processes in the temperature range 60-300 K. Whereas at low temperature, a relaxation mechanism of a dipolar type was disclosed within the temperature interval centred around 100 K. a space-charge relaxation process could be identified in the temperature range 120-300 K. The temperature dependence of the relaxation parameters will be also discussed in detail.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 3