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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

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

Revista

Título: Journal of Magnetism and Magnetic Materials

Vol. 226

Páginas: 821-823

ISSN: 0304-8853

Editora: Elsevier

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 3