Synthesis and Electrical Properties of a Fluorite-Like Nd5Mo3O16 Compound with Partial Substitution of Molybdenum by Tungsten,Niobium, or Vanadium |
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Authors: | V. I. Voronkova E. P. Kharitonova E. I. Orlova |
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Affiliation: | 1.Moscow State University,Moscow,Russia |
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Abstract: | The phase formation of Nd5Mo3 – xW x O16.5, Nd5Mo3 – xNb x O16.5 – х/2, and Nd5Mo3 – xV x O16.5 – х/2 solid solutions based on a fluorite-like Nd5Mo3O16.5 compound (mixed conductor with interstitial oxygen conductivity) has been studied. The electrical conductivity of doped compounds obeys the Arrhenius law and, at a low impurity content, is as high as 0.03–0.08 S/cm at 800°C. Substitution of Mo6+ cations by V5+ and Nb5+ cations reduces the interstitial oxygen content, which causes a decrease in the solid-solution electrical conductivity by 1–2 orders of magnitude and a decrease in the cubic unit-cell parameter. A wide diffuse anomaly with a maximum of about 1500–4000 has been observed in the temperature dependence of the permittivity for all single-crystal and polycrystalline samples in the range of 300–900°C. |
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