Abstract

Potassium tungstate antimonates were prepared by calcining αK2CO3 + βSb2O3 + 2(1 – α – β)WO3 mixtures in air. Data on the phase composition of the obtained materials were used to locate the pyrochlore phase region in the Sb2Oz–W2O6 – K2O composition triangle at 1170 K. The distributions of the constituent ions and lattice defects over the crystallographic positions of space group Fd3m were inferred from structural and gravimetric data. The ac conductivity of the potassium tungstate antimonates was measured from 600 to 1000 K. The conductivity and its activation energy were shown to be correlated with the concentrations of cation (position 16d) and anion (position 8b) defects. The concentration and mobility of K+ ions involved in charge transport were determined.

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