Complete series of solid solutions exist in the mixed oxide pyrochlore system, Er23+ (V1−x3+ Fex3+)4/3 W23/6+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.
Volume 42 | Issue 6
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