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.
No takes yet. Share an insight, caveat, or question.
King et al. (1988) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: