Ferroelectric phase transitions in the system PbTiO3,-KNbO3

Tien, T.-Y. ; Subbarao, E. C. ; Hrizo, J. (1962) Ferroelectric phase transitions in the system PbTiO3,-KNbO3 Journal of the American Ceramic Society, 45 (12). 572–575. ISSN 0002-7820

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1151-...

Related URL: http://dx.doi.org/10.1111/j.1151-2916.1962.tb11061.x


The formation of a complete series of solid solutions in the system PbTiO3-KNbO3 was established by X-ray and dielectric studies. The room-temperature symmetry of the entire system was tetragonal except for compositions containing more than 96 mole % KNbO3, which had orthorhombic symmetry. The axial ratio, c/a, and the ferroelectric Curie temperature decreased from both the end-members. The lowest Curie temperature observed in the system was 175° C for the composition with 80 mole % KNbO3. A generalization has been made on the variation of ferroelectric Curie temperatures with compositions in binary systems of perovskitetype solid solutions with and without a common cation.

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