Abstract
Solubility limits have been determined for a number of solid solutions based on ferroelectric Bi 4Ti 3O 12. Several di- and trivalent ions substitute readily for bismuth in the perovskite layer, but the octahedral site and the bismuth oxide layer are far less flexible, tolerating only very limited solid solution. Dimensional mismatch between the perovskite layer and the bismuth oxide layer provides an adequate explanation of the structural stability.
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