Investigation of the structural and microstructural properties of Gd3+-modified BaTiO3 ceramics

• Autor(a) principal: Oliveira, M. A. [UNESP]
• Data de Publicação: 2019
• Outros Autores: Silva, M. C.O., M’peko, J. C., Hernandes, A. C., Mendez-González, Y., Guerra, J. D.S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1080/00150193.2019.1621710; http://hdl.handle.net/11449/189543
• topic: Barium titanate; ceramics; Pechini’s method; structural properties

Structural and microstructural properties of lead-free BaBa1− xGdxTiO3 ceramics are investigated. The results confirm the formation of the ferroelectric phase, for all the cases, revealing a decrease in the unit-cell volume (V) with the increase of the gadolinium concentration, which can be associated to the difference between the ionic-radii of the involved ions (Gd3+ and Ba2+). A decrease in the average grain-size, with the increase of the Gd3+ content, was associated to the pinning effect (typical of rare-earths) due to the contribution of minor additional phase, which is not easily detectable by X-ray diffraction technique at very low dopant concentrations.