Crystal Structure and Defects of Ordered (Pb1-xCax)TiO3 |
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| Authors: | GRACE KING EDWARD GOO TAKASHI YAMAMOTO KIYOSHI OKAZAKI |
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| Affiliation: | Department of Materials Science and Engineering, University of Southern California, Los Angeles, California 90089-0241;Department of Electrical Engineering, National Defense Academy, Yokosuka 239, Japan |
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| Abstract: | Crystal structure and defects of ordered ((Pb1- x Ca x )TiO3 ceramics have been investigated by transmission electron microscopy. The structure is determined to be tetragonal, belonging to point group 4 mm . Pb and Ca are in an ordered fcc arrangement on the A sites. In addition to the chemical ordering, there is ordering due to atomic shuffling or what has been referred to as electrical ordering. Two distinct sets of planar defects are observed in the same region. One set of planar defects are identified as antiphase boundaries that are the results of chemical ordering and the other set are displacement boundaries that are the results of electrical ordering. |
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