Citation
Tan, Kar Ban and Khaw, C. C. and Lee, C. K. and Zainal, Z. and Tan, Y. P. and Shaari, Hasnizam
(2009)
High temperature impedance spectroscopy study of non-stoichiometric bismuth zinc niobate pyrochlore.
Materials Science-Poland, 27 (3).
pp. 825-837.
ISSN 2083-1331; ESSN: 2083-134X
Abstract
Single phase non-stoichiometric bismuth zinc niobate, Bi3Zn1.84Nb3O13.84, was fabricated by a conventional solid state method. The sample was refined and fully indexed on the cubic system, space group Fd3m (No. 227), Z = 4 with a = 10.5579(4) �. Electrical characterisation was performed using an ac impedance analyser over the temperature range of 25-850 �C and frequency range of 5 Hz-13 MHz. Typical dielectric response is observed in Bi3 Zn1.84Nb3O13.84 with a high relative permittivity, low dielectric loss and a negative temperature coefficient of capacitance, with the values of 147, 0.002 and -396 ppm/�C, at 100 kHz at ambient temperature, respectively. This material is highly resistive, with a conductivity of 1�10-21 O-1�cm-1 and a high activation energy of ca. 1.59 eV.
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