Solid state studies on rare earth mixed oxide pyrochlores Er2(V1−x Fe x )4/3 W2/3O7
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Complete series of solid solutions exist in the mixed oxide pyrochlore system, Er 2 3+ (V 1−x 3+ Fe x 3+ )4/3 W 2 3/6+ O7, with the crystal structure changing from cubic to rhombohedral atx=0·25. The compounds are semiconductors at 300 K exhibitingp- orn-type behaviour depending on the value ofx. The observed resistivity and Seebeck coefficient data as a function of temperature have been interpreted in terms of a hopping mechanism.
KeywordsMixed pyrochlores electrical properties mechanism of conduction
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