Dielectric Properties of Nanocrystalline Tungsten Oxide in the Temperature Range of 223–293 K


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The dielectric properties of nanocrystalline tungsten oxide are studied in the temperature range of 223–293 K and in the frequency range ν = 10–2–106 Hz. Powders of WO3 with particle sizes of 110, 150, and 200 nm are prepared by the heat treatment of ammonium paratungstate at various temperatures. It is established that the frequency dependences of the conductivity for all samples increase with an increase in frequency, while the polarization characteristics ε'(ν) and ε"(ν) decrease. It is found that the frequency dependences of the conductivity are described by a function of the form νs with an index in the range of (0.83–0.90) ± 0.01, which is characteristic of the “hopping” mechanism of charged-particle motion (complexes) over localized states confined by potential barriers and structural defects.

Sobre autores

S. Kozyukhin

Kurnakov Institute of General and Inorganic Chemistry; National Research Tomsk State University (Faculty of Chemistry)

Autor responsável pela correspondência
Email: sergkoz@igic.ras.ru
Rússia, Moscow, 119991; Tomsk, 634050

S. Bedin

Moscow Pedagogical State University

Email: sergkoz@igic.ras.ru
Rússia, Moscow, 119991

P. Rudakovskaya

Kurnakov Institute of General and Inorganic Chemistry

Email: sergkoz@igic.ras.ru
Rússia, Moscow, 119991

O. Ivanova

Kurnakov Institute of General and Inorganic Chemistry

Email: sergkoz@igic.ras.ru
Rússia, Moscow, 119991

V. Ivanov

Kurnakov Institute of General and Inorganic Chemistry; Moscow University of Technology

Email: sergkoz@igic.ras.ru
Rússia, Moscow, 119991; Moscow, 119454

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