Temperature dependence of faceting in ∑5(310)[001] grain boundary of SrTiO3 [Acta Materialia 51(4), pp. 975–981]

Lee, Sung Bo; Sigle, Wilfried; Kurtz, Wolfgang; Rühle, M.

doi:10.1016/s1359-6454(03)00037-5

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“…Strontium titanate is known to be a highly anisotropic material in terms of deformation characteristics (Gumbsch et al, 2001), interface energy and mobility (Sano et al, 2003;Lee et al, 2003;Kang et al, 2003;Rheinheimer, Ba ¨urer, Chien et al, 2015). Investigations on the grain-growth kinetics of strontium titanate show a very unusual deviation from the expected Arrhenius-type behavior in that there is a dramatic decrease in the grain growth rate by three orders of magnitude when the annealing temperature is increased above a critical temperature (Ba ¨urer, Weygand et al, 2009;Amaral et al, 2013;.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive evaluation of 3D microstructure evolution in strontium titanate

et al. 2020

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Nondestructive X‐ray diffraction contrast tomography imaging was used to characterize the microstructure evolution in a polycrystalline bulk strontium titanate specimen. Simultaneous acquisition of diffraction and absorption information allows for the reconstruction of shape and orientation of more than 800 grains in the specimen as well as porosity. Three‐dimensional microstructure reconstructions of two coarsening states of the same specimen are presented alongside a detailed exploration of the crystallographic, topological and morphological characteristics of the evolving microstructure. The overall analysis of the 3D structure shows a clear signature of the grain boundary anisotropy, which can be correlated to surface energy anisotropy: the grain boundary plane distribution function shows an excess of ⟨100⟩‐oriented interfaces with respect to a random structure. The results are discussed in the context of interface property anisotropy effects.

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