TY - JOUR
T1 - Grain-boundary faceting at a Σ = 3, [110]/{112} grain boundary in a cubic zirconia bicrystal
AU - Shibata, Naoya
AU - Oba, Fumiyasu
AU - Yamamoto, Takahisa
AU - Sakuma, Taketo
AU - Ikuhara, Yuichi
N1 - Funding Information:
ACKNOWLEDGEMENTS The authors wish to thank Dr J. Gale for allowing us to use the GULP program code. This work (N. Shibata and F. Oba) was financially supported by a Grant-in-Aid for Japan Society for the Promotion of Science Fellows from the Ministry of Education, Culture, Sports, Science and Technology, Japan. Part of this work was also supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and PRESTO, Japan Science and Technology Corporation (Y. Ikuhara).
PY - 2003/7/1
Y1 - 2003/7/1
N2 - The atomic structure of a Σ = 3, [110]/{112} grain boundary in a yttria-stabilized cubic zirconia bicrystal has been investigated by high-resolution transmission electron microscopy (HRTEM). It was found that the grain boundary migrated to form periodic facets, although the bicrystal was initially joined so as to have the symmetric boundary plane of {112}. The faceted boundary planes were indexed as {111}/{115}. The structure of the {111}/{115} grain boundary was composed of an alternate array of two types of structure unit: {112}- and {111}-type structure units. HRTEM observations combined with lattice statics calculations verified that both crystals were relatively shifted by (a/4)[110] along the rotation axis to form a stable grain-boundary structure. A weak-beam dark-field image revealed that there was a periodic array of dislocations along the grain boundary. The grain-boundary dislocations were considered to be introduced by the slight misorientation from the perfect Σ = 3 orientation. The fact that the periodicity of the facets corresponded to that of the grain-boundary dislocations must indicate that the introduction of the grain-boundary dislocations is closely related to the periodicity of the facets. An atomic flipping model has been proposed for the facet growth from the initial Σ = 3, {112} grain boundary.
AB - The atomic structure of a Σ = 3, [110]/{112} grain boundary in a yttria-stabilized cubic zirconia bicrystal has been investigated by high-resolution transmission electron microscopy (HRTEM). It was found that the grain boundary migrated to form periodic facets, although the bicrystal was initially joined so as to have the symmetric boundary plane of {112}. The faceted boundary planes were indexed as {111}/{115}. The structure of the {111}/{115} grain boundary was composed of an alternate array of two types of structure unit: {112}- and {111}-type structure units. HRTEM observations combined with lattice statics calculations verified that both crystals were relatively shifted by (a/4)[110] along the rotation axis to form a stable grain-boundary structure. A weak-beam dark-field image revealed that there was a periodic array of dislocations along the grain boundary. The grain-boundary dislocations were considered to be introduced by the slight misorientation from the perfect Σ = 3 orientation. The fact that the periodicity of the facets corresponded to that of the grain-boundary dislocations must indicate that the introduction of the grain-boundary dislocations is closely related to the periodicity of the facets. An atomic flipping model has been proposed for the facet growth from the initial Σ = 3, {112} grain boundary.
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U2 - 10.1080/0141861031000108231
DO - 10.1080/0141861031000108231
M3 - Article
AN - SCOPUS:0242317258
VL - 83
SP - 2221
EP - 2246
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 19
ER -