Disruption of Dislocation Cores at Grain Boundary in Nb-Doped SrTiO3 Bicrystals


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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.



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




S.Y. Choi et al., "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




[1] N. Yamaoka, M. Masuyama, and M. Fukui, J. Am. Ceram. Soc. Bull. Vol. 68 (1983), p.698.

[2] M. Fujimoto, Y. -M. Chiang, A. Roshko, and W. D. Kingery, J. Am. Ceram. Soc. Vol. 68 (1985), p. C300.

[3] M. Nishi, T. Tanaka, K. Matsunaga, Y. Ikuhara and T. Yamamoto, Mater. Trans. Vol. 45 (2004), p.2112.

[4] S. -Y. Choi, J. P. Buban, M. Nishi, H. Kageyama, N. Shibata, T. Yamamoto, S. -J. L. Kang and Y. Ikuhara, J. Mater. Sci. Vol. 41 (2006), p.2621.

[5] Z. Zhang, W. Sigle, and M. Rühle, Phys. Rev. B Vol. 66 (2002), pp.094108-1.

[6] J. P. Buban, K. Matsunaga, J. Chen, N. Shibata, W. Y. Ching, T. Yamamoto and Y. Ikuhara: Science Vol. 311 (2006), p.212.

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