SYNTHESIS, THERMAL AND ELECTRICAL PROPERTIES OF Bi2NiNb2O9 WITH PYROCHLORE STRUCTURE

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Abstract

Nickel-containing cubic pyrochlore Bi2NiNb2O9 (sp. gr. Fd3m, a = 10.53657(6) Å) was synthesized by the citrate method. At the synthesis temperature of 1050°C, low-porosity ceramics with unclear grain boundary outlines are formed. The disordered structure of pyrochlore (sp. gr. Fd3m, a = 10.53784 Å, Z = 4) was refined by the Rietveld method based on X-ray powder diffraction data. The studied pyrochlore belongs to isotropically expanding oxide compounds with an average value of the thermal expansion coefficient of (6.4 × 10−6)°C−1 in the range of 30–750°C. Above 1110°C, thermal dissociation of Bi2NiNb2O9 occurs with the formation of the impurity phase NiNb2O6. Bi2NiNb2O9 is characterized by a high activation energy of 1.43 eV and a frequency- and temperature-independent permittivity of 144 (up to 300°C), low dielectric losses of ~ 0.002 at 1 MHz. The studied ceramics can be used as a high-frequency dielectric material in the creation of multilayer ceramic capacitors.

About the authors

K. A Badanina

Syktyvkar State University

Email: Badanina-Ksenia@mail.ru
Syktyvkar, 167001 Russia

N. A Sekushin

Institute of Chemistry of the Komi Science Center UB RAS

Email: Badanina-Ksenia@mail.ru
Syktyvkar, 167982 Russia

M. G Krzhizhanovskaya

Saint Petersburg State University

Email: Badanina-Ksenia@mail.ru
St. Petersburg, 199034 Russia

N. A Zhuk

Syktyvkar State University

Author for correspondence.
Email: Badanina-Ksenia@mail.ru
Syktyvkar, 167001 Russia

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