The electrical properties of the complex oxide Bi2Сu0.25Ni0.75Ta2O9 with a pyrochlore structure (space group Fd-3m, 10.5200(5) ?), synthesized by the solid-phase method, were studied using impedance spectroscopy. The porous microstructure of the ceramic is formed by partially fused, rounded ceramic grains with longitudinal dimensions of 1…2 ?m. Impedance plots were analyzed, and electrical circuits describing the sample's behavior with increasing temperature were modeled. The activation energy for the sample's conductivity is virtually independent of temperature and is 0.466(5) eV, typical of semiconductors. No dielectric relaxation was observed for the sample. A bipolar conductivity model was proposed to describe the sample's electrical behavior.
Nikolay A. Sekushin – Doctor of Physics and Mathematics. Sci., senior researcher, Laboratory of Materials Science, Institute of Chemistry, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
Nadezhda A. Zhuk – Candidate of Chemical Sciences, Associate Professor, senior researcher, Laboratory of Ceramic Materials Science, Pitirim Sorokin Syktyvkar State University, Syktyvkar, Russia
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DOI: 10.14489/glc.2026.09.pp.048-054
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