Citation
Chon, Mun Ping and Tan, Kar Ban and Khaw, Chwin Chieh and Zainal, Zulkarnain and Yap, Taufiq Yun Hin
(2011)
Preparation and characterization of new Bi1.5-xCuNb1.5+xO7+x pyrochlores.
Solid State Science and Technology, 19 (1).
pp. 175-189.
ISSN 0128-7389
Abstract
A new pyrochlore solid solution, Bi1.5-xCuNb1.5+xO7+x has been synthesized using conventional solid state method. The synthesized ceramic samples were fired at 925ºC
and their phase purities were analyzed using Shimadzu XRD-6000, X-ray powder diffractometer. The refinement process was performed using Chekcell programme with
Fd-3m symmetry. The cubic pyrochlore structures were confirmed with a = 10.5024 (3) Å and 10.5092 (5) Å for x = 0.1 and x = 0.2, respectively. Lattice constants of the cubic pyrochlore have been found increased with increase of Nb content. On the other hand, the resulting powder was pelletized and sintered at sintering temperature prior to
impedance spectroscopy (IS) measurement. The electrical measurement was carried out in the frequency range of 0.1 Hz – 10 MHz over a temperature from room temperature
to 800ºC, in both cooling and heating cycles.
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