β Scribed by T. S. Kayed; A. Mergen
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Bi~1.5~ZnSb~1.5~O~7~ pyrochlore samples were prepared by solid state reaction method. They were examined by xβray diffraction and scanning electron microscopy. Single phase, belongs to the cubic pyrochlore structure, with a lattice parameter of 10.442 Γ and grain size that varies from 16 to 20 ΞΌm was obtained. The electrical properties were measured at different temperatures in the range 15β330 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 IβV measurements (double transition of the slope of IβV characteristics (Ξ²) at the same temperatures). This was discussed in terms of polarization phenomenon and mixed ionicβelectronic conduction. (Β© 2003 WILEYβVCH Verlag GmbH & Co. KGaA, Weinheim)
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