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New Family of Dielectric Materials in Ca–Y–Ti–Nb–O System Having Pyrochlore Type Structure

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Abstract:

A new family of pyrochlore-type oxides in the Ca–Y–Ti–Nb–O system has been prepared by the conventional solid-state route. These compounds have a dielectric constant (K) in the range 27–92 and, further, the dielectric properties are found to be independent of frequency in the 100 Hz to 1 MHz range for all the compositions in the temperature range 30°–100°C. Their temperature coefficient of the dielectric constant is negative and in the range −80 to −612 ppm/°C. Rietveld analysis of the X-ray diffraction data establishes a cubic pyrochlore-type phase in the space group Fd3m (no. 227). A variation in the stoichiometry of the cations in the system does not change the pyrochlore-type structure.

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1551-2916.2007.01933.x

Affiliations: Materials and Minerals Division, Regional Research Laboratory, Trivandrum 695 019, India

Publication date: 2007-11-01

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