Paper Title:
Disruption of Dislocation Cores at Grain Boundary in Nb-Doped SrTiO3 Bicrystals
  Abstract

Bicrystals of Nb-doped SrTiO3, having tilt angles of 4o~18 o with respect to [001], were prepared by joining two single crystals at 1873 K and then investigated to identify the effect of tilt angle on the grain boundary structure. The boundaries consisted of a regular array of dislocations but the positioning of cores along the boundary was found to be changed from a line to a zigzag as a tilt angle was increased up to 10o. The 14° - tilted boundary exhibited two kinds of boundary region exist at the same grain boundary; (1) the discrete cores region as observed in 4° ~ 10° - tilted boundaries and (2) the randomly oriented region as found in the 18° boundary. Thus it was observed that the structure of low-angle tilt boundary changed from the discrete dislocation structure to the randomly oriented structure as a tilt angle increases. These structural changes at the grain boundaries are considered to be related to a minimization of strain due to the high density of dislocations.

  Info
Periodical
Materials Science Forum (Volumes 558-559)
Edited by
S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara
Pages
869-872
DOI
10.4028/www.scientific.net/MSF.558-559.869
Citation
S.Y. Choi, J.P. Buban, N. Shibata, T. Yamamoto, Y. Ikuhara, "Disruption of Dislocation Cores at Grain Boundary in Nb-Doped SrTiO3 Bicrystals", Materials Science Forum, Vols. 558-559, pp. 869-872, 2007
Online since
October 2007
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