Effect of the excess of bismuth on the morphology and properties of the BaBi2Ta2O9 ceramics
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/03/2005
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Resumo |
In this study, the effect of bismuth content on the crystal structure, morphology and electric properties of barium-bismuth-tantalate (BBT) ceramics was explored with the aid of X-ray diffraction (XRD), scanning electron microcopy (SEM), dielectric properties and ferroelectric hysteresis loops. BaBi2Ta2O9 (BBT) ceramics have been successfully prepared by the solid-state reaction. The BBT phase was crystallized at 900 degreesC for 2 h. The excess of bismuth controls the grain size, affecting the density of the material. Measurements of dieletric constant and dieletric losses confirm that the material is a ferroeletric with a Curie temperature around 77 degreesC. The dieletric constant measured at room temperature was 400, with a dielectric loss of 0.03. Both the phase-transition behaviour and ferroelectric properties, such as spontaneous polarization (P-s), showed a dependence on Bi content. (C) 2004 Elsevier B.V. All rights reserved. |
Formato |
656-661 |
Identificador |
http://dx.doi.org/10.1016/j.matlet.2004.11.001 Materials Letters. Amsterdam: Elsevier B.V., v. 59, n. 6, p. 656-661, 2005. 0167-577X http://hdl.handle.net/11449/35049 10.1016/j.matlet.2004.11.001 WOS:000226802500011 |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
Materials Letters |
Direitos |
closedAccess |
Palavras-Chave | #ceramics #electrical properties #fatigue #sintering |
Tipo |
info:eu-repo/semantics/article |