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Grain growth transitions of perovskite ceramics and their relationship to abnormal grain growth and bimodal microstructures

Rheinheimer, Wolfgang; Hoffmann, Michael J.

Abstract:
Barium titanate, strontium titanate, and lithium lanthanum titanate (LLTO) were used to study grain growth in perovskite ceramics. In these materials, a grain growth transition was found. In the case of barium titanate, grain growth shows a gradual transition to faster growth with increasing temperature, whereas strontium titanate indicates exponentially decreasing grain growth with increasing temperature. In reducing atmosphere, strontium titanate shows two transitions; the additional second transition is attributed to a reversible wetting transition. In LLTO, a single grain growth transition was found and seems to be caused by a wetting transition as well. In all cases, the grain growth transitions are strongly correlated to abnormal grain growth. This non-Arrhenius behavior of grain growth in perovskites is discussed in relation to abnormal grain growth and bimodal microstructures: the existence and coexistence of two grain boundary types with different grain boundary mobility is proposed. In this framework, a gradual transition of the boundary population from type 1 to type 2 with temperature seems to cause the growth phenomena ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 0022-2461
KITopen ID: 1000051665
HGF-Programm 43.22.03; LK 01
Erschienen in Journal of Materials Science
Band 51
Heft 4
Seiten 1756-1765
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