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

• Type: Article in International Scientific Journal
• Date: 2007

Authors

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

Journal

Title: Journal of the European Ceramic Society

Vol. 27

Pages: 3701-3703

ISSN: 0955-2219

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 6 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3