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Crystal Structure and Defects of Ordered (Pb 1‐ x Ca x )TiO 3
Author(s) -
KING GRACE,
GOO EDWARD,
YAMAMOTO TAKASHI,
OKAZAKI KIYOSHI
Publication year - 1988
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.1151-2916.1988.tb05894.x
Subject(s) - tetragonal crystal system , crystallographic defect , materials science , crystallography , crystal structure , planar , transmission electron microscopy , displacement (psychology) , condensed matter physics , chemistry , nanotechnology , physics , psychology , computer graphics (images) , computer science , psychotherapist
Crystal structure and defects of ordered ((Pb 1‐ x Ca x )TiO 3 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.