Abstract
Solid–phase synthesis is used to obtain the composites of {(100%–x)CaWO4–xV2O5}, {(100%–x)LaVO4–xV2O5}. Ceramic samples are characterized using the XRD technique; the systems contain two phases and are eutectic. Temperature dependences of overall conductivity σ of composites are obtained. The concentration dependence of conductivity of the {(100%–x)CaWO4–xV2O5} composites is of interest as the conductivity jump reaches 5 orders of magnitude as compared to pure CaWO4. σ is close to purely ionic in the range of 0 < x < 1 mol %, which was determined using the EMF technique and on the basis of the character of the σ(\({P_{{O_2}}}\)) dependence. For the system of {(100%–x)LaVO4–xV2O5} at 1–5 mol % of V2O5, an increase in conductivity by two orders of magnitude is observed and the ion conductivity component prevails for the composite with the additive of 1 mol % of V2O5.
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