New dielectric materials based on pyrochlore-type oxides-Ca3RE3Ti7Ta2O26.5 (RE = Pr, Sm, Gd, Dy or Y): Structure, FT-IR spectra, microstructure and dielectric properties

Abstract

New dielectric materials based on complex oxides containing rare earth tantalates: Ca3RE3Ti7Ta2O26.5 (RE = Pr, Sm, Gd, Dy or Y) have been investigated for their structure, FT-IR spectra, microstructure and dielectric properties. Structural analysis using the techniques of x-ray powder diffraction coupled with fourier transform infrared spectroscopy (FT-IR) shows that the titled compounds crystallize with the cubic pyrochlore type structure. Microstructure analysis by means of scanning electron microscope exhibits that sintering the pellets at 1450 degrees C shows dense microstructure with well formed grains. The dielectric permittivity (epsilon(r)) and dielectric loss (tan delta) of the pellets sintered at 1450 degrees C are found to be varying from 41-80 and 0.0715-0.0570 respectively at 100 kHz.