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Erschienen in:
30.04.2016
Structure and dielectric properties of a novel defect pyrochlore Bi1.34Fe0.66Nb1.34O6.35 ceramic
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 8/2016
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Abstract
Lead-free ceramic with the composition of Bi1.34Fe0.66Nb1.34O6.35 was prepared by a solid state reaction method. The phase structure, microstructure and dielectric performances of Bi1.34Fe0.66Nb1.34O6.35 ceramic were systematically investigated. X-ray diffraction pattern showed that the ceramic has a cubic pyrochlore structure with a unit cell parameter of a = 10.4998 Å. When the sintering temperature was 1000 °C, the ceramic possessed excellent dielectric performance with high relative permittivity of ~165 and low dielectric loss of ~1 %. Furthermore, Bi1.34Fe0.66Nb1.34O6.35 ceramic exhibits a near-zero temperature coefficient of ~+ 21 ppm/°C, which indicates that this ceramic is a promising candidate for thermally stable devices.