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Journal of Electron Microscopy 50:429-433 (2001)
© 2001 Oxford University Press

Paper

Structure of [110] tilt grain boundaries in zirconia bicrystals

Naoya Shibata, Takahisa Yamamoto, Yuichi Ikuhara and Taketo Sakuma

Department of Materials Science, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
Engineering Research Institute, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

Cubic stabilized zirconia bicrystals with [110] symmetric tilt grain boundaries were fabricated by diffusion bonding of two single crystals with the composition of ZrO2-9.6mol%Y2O3. The structures of symmetric tilt small angle grain boundary and two types of symmetric tilt {Sigma}3 grain boundaries with different grain boundary planes were observed by transmission electron microscopy (TEM). High-resolution transmission electron microscopy (HREM) observations clarified that the [110] small angle tilt grain boundary consists of periodic array of b = a/2 [110] type edge dislocations. This result is consistent with Frank's dislocation model for small angle grain boundary. HREM observation also revealed that the 70.5° {Sigma}3 grain boundary shows atomically coherent grain boundary structure with the boundary plane of {111}, while the 109.5° {Sigma}3 grain boundary accompanies grain boundary facets taking {111} / {115} asymmetric grain boundary plane. Because of the very low surface energy of {111} plane and/or high lattice matching of {111} and {115} type planes, the grain boundary faceting may be preferred in spite of increasing grain boundary area to about 6%. TEM–energy-dispersive X-ray spectroscopy (EDS) analyses were performed on both {Sigma}3 grain boundaries, and the segregation of yttrium ions to the boundaries was detected in both cases. The amount of segregation is about the same in both {Sigma}3 boundaries. It can be concluded that the segregation of yttrium ions to {Sigma}3 grain boundary exists in cubic zirconia.

Keywords     zirconia, bicrystal, grain boundary, segregation, HRTEM, TEM–EDS analysis


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