Non-destructive evaluation of 3D microstructure evolution in strontium titanate

TitleNon-destructive evaluation of 3D microstructure evolution in strontium titanate
Publication TypeJournal Article
Year of Publication2020
AuthorsTrenkle A, Syha M, Rheinheimer W, Callahan P, Nhuyen L, Ludwig W, Lenthe W, Echlin M, Pollock T, Weygand D, Hoffmann M, Gumbsch P
JournalJournal of Applied Crystallography
Keywords3d materials, contrast tomography, diffraction, grain growth, microstructure evolution, nondestructive x-ray diffraction contrast, science, strontium titanate, to, tomography imaging was used

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.