Doping manganites by La-site vacancies and Ca ions: bulk ceramics and thin films

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Araújo, João Pedro (Author) Other; Amaral, V. S. (Author) Other; Tavares, Pedro B. (Author) Other; Lencart-Silva, F. (Author) Other; Lourenço, A. A C S (Author) Other; Sousa, João Bessa (Author) FCUP; Vieira, Joaquim Manuel (Author) Other

Journal

Title: Journal of Magnetism and Magnetic Materials

Vol. 226

Pages: 821-823

ISSN: 0304-8853

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-000-VPG

DOI: 10.1016/s0304-8853(01)00075-0

Abstract (EN): The effects of La manganite doping by Ca and A-site vacancies are compared in thin films and bulk ceramics. In bulk, rombohedric, orthorhombic or mixed manganite crystallographic phases are found. depending on the Ca content. It is found that up to a certain level. the increase of Tc by Ca and vacancy doping is cumulative. Maximum T-c obtained in bulk samples after oxygen annealing is limited by the optimum stoichiometric doping value (T-c similar to 267 K for La0.67Ca0.33MnO3), but in thin films T-c up to 300 K are obtained. The oxygen incorporation process is a crucial factor for the optimization of T-c especially in vacancy-doped samples. (C) 2001 Published by Elsevier Science B.V.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3