التفاصيل البيبلوغرافية
| العنوان: |
Dislocation Loops in Pressureless-Sintered Undoped BaTiO3 Ceramics. |
| المؤلفون: |
Yu-Chuan Wu, Ching-Ying Chen, Hong-Yang Lu, McCauley, Daniel E., Chu, Mike S. H. |
| المصدر: |
Journal of the American Ceramic Society; Jul2006, Vol. 89 Issue 7, p2213-2219, 7p, 5 Black and White Photographs, 4 Diagrams, 2 Charts |
| مصطلحات موضوعية: |
CERAMIC materials, SINTERING, DISLOCATIONS in metals, TRANSMISSION electron microscopy, CATIONS |
| مستخلص: |
Dislocation loops in pressureless-sintered undoped BaTiO3 ceramics have been analyzed by transmission electron microscopy. The Burgers vector of the loops and its sense b=+1/2[010] were determined using the g·b=0 invisibility criteria, combined with the inside–outside contrast technique using ( g·b) s g>0 or<0, keeping the deviation parameter s g>0. The edge-vacancy nature was further ascertained by determining the loop habit plane normal n=[0 0]. Weak-beam dark-field imaging reveals that loops contained no stacking fault fringes; they are edge-vacancy partial dislocation loops lying in {020} or {010} where parts of the TiO2 or BaO layer are vacant. It is suggested that the extrinsic defects of both cations and oxygen vacancies generated by non-stoichiometry have condensed during sintering in air and are responsible for the formation of such vacancy loops. [ABSTRACT FROM AUTHOR] |
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