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Growth of single crystalline seeds into polycrystalline strontium titanate: Anisotropy of the mobility, intrinsic drag effects and kinetic shape of grain boundaries

Rheinheimer, W.; Bäurer, W.; Handwerker, C.A.; Blendell, J.E.; Hoffmann, M.J.

Abstract We present a suite of measurements and combined analyses of grain growth in SrTiO3 for oriented single crystals into polycrystals. The growth distance and standard deviation and the microstructure evolution along the single crystal–matrix interface are used to locally characterize the change in migration behavior as a function of temperature, time and interface orientation. The relative grain boundary mobility was determined between 1250 Â°C and 1600 Â°C for four crystallographic orientations {1 0 0}, {1 1 0}, {1 1 1} and {3 1 0}. An absolute mobility of these orientations is estimated. Under fast growth conditions the morphology of single crystals shows macroscopic stepping with parts of the interface rotating to low mobility orientations. This effect represents a kinetic influence on the grain boundary morphology. The results also indicate dragging effects on microstructure coarsening, which indicate the existence of a critical driving force for grain growth. This critical driving force seems to be related to an ‘intrinsic’ int ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1359-6454
KITopen ID: 1000051664
HGF-Programm 43.22.03; LK 01
Erschienen in Acta Materialia
Band 95
Seiten 111-123
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