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Phase Equilibria and Crystal Chemistry of the Binary and Ternary Barium Polytitanates and Crystallography of the Barium Zinc Polytitanates

The ternary system BaO-ZnO-TiO 2 is of great interest for use in the production of microwave dielectric ceramics, as the temperature coefficient of the dielectric constant for a ternary phase in the system has the opposite sign from that of the major component in such devices, BaTi 4O 9. The ternary...

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Bibliographic Details
Published in:Journal of solid state chemistry 1993-05, Vol.104 (1), p.99-118
Main Authors: Roth, R.S., Rawn, C.J., Lindsay, C.G., Wong-Ng, W.
Format: Article
Language:English
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Summary:The ternary system BaO-ZnO-TiO 2 is of great interest for use in the production of microwave dielectric ceramics, as the temperature coefficient of the dielectric constant for a ternary phase in the system has the opposite sign from that of the major component in such devices, BaTi 4O 9. The ternary system has been found to contain four ternary phases, ideally BaZn 2Ti 4O 11, Ba 4ZnTi 11O 27, Ba 2ZnTi 5O 13, and Ba x Zn x Ti 8- x O 16-hollandite. Compatibility triangles for the ternary system have been established and the crystal chemistry and crystal structure of each of the phases was investigated. The phase equilibria data and crystal structures are compared with those encountered in the binary system and other ternary and more complex systems involving barium polytitanates.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1993.1145