Metastable perovskite Bi1-xLaxFe0.5Sc0.5O3 phases in the range of the compositional crossover

• Autor(a) principal: Salak, A. N.
• Data de Publicação: 2017
• Outros Autores: Khalyavin, D. D., Zamaraite, I., Stanulis, A., Kareiva, A., Shilin, A. D., Rubanik, V. V., Radyush, Yu. V., Pushkarev, A. V., Olekhnovich, N. M., Starykevich, M., Grigalaitis, R., Ivanov, M., Banys, J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/25393
• topic: Multiferroic; Metastable phase; Sol-gel method; High-pressure synthesis

Perovskite ceramics of the Bi1- xLaxFe0.5Sc0.5O3 composition (0.30 ≤ x ≤ 0.35) that cannot be sintered in bulk form as a single phase using the conventional ceramic route were successfully prepared using the high-pressure/high-temperature technique. It has been shown that the room-temperature compositional crossover from the antipolar phase whose incommensurate modulation of displacements of Bi/La and oxygen is described by the Imma(00γ)s00 superspace group to the non-polar Pnma phase occurs in the narrow range between x = 0.33 and x = 0.34 with no phase coexistence. The features of this compositional crossover are discussed in comparison with that observed in the Bi1- xLaxFeO3 system.