Crystal Research and Technology
Cryst. Res. Technol. 38, 1077 (2003) - Abstract -

Electrical properties of Bi1.5ZnSb1.5O7 pyrochlore ceramics

T. S. Kayed and A. Mergen*

Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey
*Eti Holding A. S., Ar-Ge Dai. Bsk., Istanbul Yolu 9. km, Güvercinlik, Ankara, Turkey

Keywords pyrochlore, varistor, Hall effect, I-V characteristics
PACS 81.05.Je, 72.80.Tm, 72.60.+g
DOI 10.1002/crat.200310139

Bi1.5ZnSb1.5O7 pyrochlore samples were prepared by solid state reaction method. They were examined by x-ray diffraction and scanning electron microscopy. Single phase, belongs to the cubic pyrochlore structure, with a lattice parameter of 10.442 Å and grain size that varies from 16 to 20 μm was obtained. The electrical properties were measured at different temperatures in the range 15-330 K under different applied magnetic fields up 1.4 T. In our measurements for Hall coefficient, Hall resistivity, and mobility; we noticed an anomalous behavior at two temperatures (around 250 and 310 K) which was supported by the I-V measurements (double transition of the slope of I-V characteristics (β) at the same temperatures). This was discussed in terms of polarization phenomenon and mixed ionic-electronic conduction.



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