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Electrical properties of Bi 1.5 ZnSb 1.5 O 7 pyrochlore ceramics
Author(s) -
Kayed T. S.,
Mergen A.
Publication year - 2003
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310139
Subject(s) - pyrochlore , electrical resistivity and conductivity , condensed matter physics , hall effect , materials science , ceramic , atmospheric temperature range , analytical chemistry (journal) , diffraction , scanning electron microscope , grain size , ionic bonding , mineralogy , phase (matter) , chemistry , thermodynamics , metallurgy , ion , physics , optics , composite material , organic chemistry , chromatography , quantum mechanics
Bi 1.5 ZnSb 1.5 O 7 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. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)