Coalescence growth mechanism of inserted tin dioxide belts in polycrystalline SnO2-based ceramics
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Data
2018-08-01
Autores
Masteghin, Mateus G. [UNESP]
Bertinotti, Rafael C. [UNESP]
Orlandi, Marcelo O. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
SnO2-based varistors have been considered promising technological devices. However their practical application is usually stated as limited to high voltage circuits based on the high breakdown electric field exhibited by these ceramics. Recently, authors have shown that the insertion of one-dimensional (1D) SnO2 belts allows overcoming this limitation. In this work, we present a detailed study of the growth mechanism of the belts inside varistors using electron microscopy techniques. We were able to show that mass transport has an intrinsic dependence on the sintering time and requires similar crystalline structure between the belts and the matrix. Dual beam and high-resolution transmission electron microscopy techniques permitted determining that 3D growth of belts occurs by coalescence.
Descrição
Palavras-chave
SnO2, Varistor, Coalescence, Ostwald-ripening, Growth mechanism, Electron microscopy
Como citar
Materials Characterization. New York: Elsevier Science Inc, v. 142, p. 289-294, 2018.