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Dislocation‐Containing Planar Faults in Metastably Retained Hexagonal Barium Titanate
Author(s) -
Wu YuChuan,
Lu HongYang
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01110.x
Subject(s) - stacking fault , dislocation , crystallography , materials science , planar , transmission electron microscopy , hexagonal crystal system , barium titanate , partial dislocations , fault (geology) , geometry , geology , ceramic , chemistry , composite material , mathematics , nanotechnology , seismology , computer graphics (images) , computer science
Planar faults, designated F 1 – F 6 and F a , with intermixed dislocations in metastably retained hexagonal‐BaTiO 3 ceramics, were found and analyzed by transmission electron microscopy. Only faults with one, two, and four extra c ‐layers parallel to the basal plane have been identified. Fault vectors R F1 =R Fa =1/6[02 2 1], R F2 =R F3 =1/3[0 1 11], R F4 =1/3[01 1 2], and R F′1 =R F5 = R F6 =R F′a =1/6[0 2 21] were determined adopting the 2πg·R=0 (or 2 n π) criteria in combination with high‐resolution imaging. Further, the embedded dislocations were half‐partials with Burgers vectors b=1/3〈10 1 0〉 determined by the g·b=0 effective invisibility criteria in conjunction with the eligible fault vectors. A rotation by 60° about the c ‐axis was found between fault segments with R F1 =1/6[02 2 1] and R F′1 =1/6[20 2 1] located on either side of a partial. Basal dislocations with b B =1/3〈1 2 10〉 have dissociated into two prism‐plane Shockley half‐partials with b Pr =1/3〈1 1 00〉 by glide in the fault plane (0002) according to 1/3〈1 2 10〉→1/3〈1 1 00〉+1/3〈0 1 10〉. The fault segment F′ 1 encompassed by two half‐partials is an extrinsic complex stacking fault.