The electrical properties of bidoped oxide pyrochlore Bi6/5Mn1/3Ni1/3Ta4/3O6+? (sp. gr. Fd-3m, a = 10.5038(9) ?), synthesized for the first time by the solid-phase method, were studied. According to scanning electron microscopy data, the ceramics is characterized by a porous microstructure formed by randomly oriented grains of an elongated shape. The average crystallite size determined by X-ray diffraction is 65 nm. The electrical properties of the samples were studied using an immittance analyzer at temperatures of 100…450 °C in the frequency range of 25…106 Hz. An electrical model of the sample was constructed in the form of an equivalent circuit, on the basis of which the relative permittivity (?25), the dielectric loss tangent (4 10–3 at a frequency of 106 Hz) and the activation energy of through conductivity (0.7 eV) were calculated. Two polarization mechanisms were established. Electronic polarization dominates in the high-frequency region. At low frequencies, ion-migration polarization is observed, with parameters close to the Warburg theoretical model.
Kristina N. Parshukova – bachelor of Chemistry Department, Syktyvkar State University, Syktyvkar, Russia
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, Komi Republic, Russia
Nadezhda A. Zhuk – Candidate of Chemical Sciences, Associate Professor, senior researcher of Laboratory of Inorganic Materials Science, Syktyvkar State University, Syktyvkar, Russia
1. Bongers P. F., Van Meurs E. R. Ferromagnetism in compounds with pyrochlore Structure // J. Appl. Phys. 1967. V. 38. P. 944–945.
2. Hiroi Z., Yamaura J.-I., Yonezawa S., Harima H. Chemical trends of superconducting properties in pyrochlore oxides // Physica C: Superconductivity and Appl. 2007. V. 460 – 462. P. 20 – 27.
3. Greedan J. E. Frustrated rare earth magnetism: Spin glasses, spin liquids and spin ices in pyrochlore oxides // J. Alloys Comp. 2006. V. 408 – 412. P. 444 – 455.
4. Murugesan S., Huda M. N., Yan Y., et al. Band-engineered bismuth titanate pyrochlores for visible light photocatalysis // J. Phys. Chem. C. 2010. V. 114. P. 10598 ? 10605.
5. Giampaoli G., Siritanon T., Day B., et al. Temperature in-dependent low loss dielectrics based on quaternary pyrochlore oxides // Prog. Solid State Chem. 2018. V. 50. P. 16 – 23.
6. Ajay Raj A., Anjana P. Anantharaman. Exploring the defect formation and ionic migration in A2Zr2O7 (A = La, Ce, Nd, and Gd) pyrochlore solid-state electrolytes // Ceram. Intern. 2024. V. 50(22). P. 48116 – 48126.
7. Matovi? B., Belozerova N. M., Kozlenko D. P., et al. High-pressure behavior of high-entropy A2B2O7 pyrochlore // Ceram. Intern. 2024. V. 50(24). P. 52649 – 52654.
8. Haiyan Guo, Kuibao Zhang, Yuxiang Li. Heavy-ion irradiation effects of high-entropy A2Ti2O7 pyrochlore with multi-elements at a site // Ceram. Intern. 2024. V. 50(12). P. 21859 – 21868.
9. Du M., Liu Sh., Ge Ya., et al. Preparation and effect of grain size on the thermal stability, phase transition, mechanical property, and photocatalytic property of pyrochlore (La0.2Nd0.2Sm0.2Gd0.2Y0.2)2Zr2O7 high-entropy oxide // Ceram. Intern. 2022. V. 48(14). P. 20667 – 20674.
10. Du J., Liu R., Wan F., et al. Study on La2(Hf1-x Tix)2O7 (x ? 0.20) pyrochlores for potential thermal/environmental barrier coating applications // Ceram. Intern. 2022. V. 48(22). P. 33563 – 33570.
11. Kang X., Li X., Chen X., et al. Novel NTC ceramics based on pyrochlore-type A2Ti2O7 (A = Sm, Eu, Y) titanates for high-temperature thermistors // Ceram. Intern. 2022. V. 48(6). P. 8773 – 8778.
12. Anantharaman A. P., Dasari H. P. Potential of pyrochlore structure materials in solid oxide fuel cell applications // Ceram. Intern. 2021. V. 47. P. 4367 – 4388.
13. Rahman R. A. U., Jain Ruth D. E., Ramaswamy M. Emerging scenario on displacive cubic bismuth pyrochlores (Bi,M)MNO7-? (M = transition metal, N = Nb, Ta, Sb) in context of their fascinating structural, dielectric and magnetic properties // Ceram. Intern. 2020. V. 46(10). P. 14346 – 14360.
14. Sun Sh., Liu Zh., Ti R., et al. Multiple dielectric relaxations and superior sonocatalysis of bismuth iron niobate pyrochlores via high-level Co-doping // Ceram. Intern. 2021. V. 47(5). P. 6049 – 6058.
15. Tang P., Cao Y., Li H., et al. The preparation of high-performance aqueous supercapacitor with high-entropy pyrochlore-type electrode and super-concentrated electrolyte // Ceram. Intern. 2022. V. 48(2). P. 2660 – 2669.
16. Mccauley R. A. structural characteristics of pyrochlore formation // J. Appl. Phys. 1980. V. 51. P. 290 – 294.
17. Vanderah T. A., Lufaso M. W., Adler A. U., et al. Subsolidus phase equilibria and properties in the system Bi2O3:Mn2O3±x:Nb2O5 // J. Sol. St. Chem. 2006. V. 179. P. 3467 – 3477.
18. Nguyen H. B., Noren L., Liu Y., et al. The disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi2O3–MO–Nb2O5 (M = Mg, Ni) systems // J. Sol. St. Chem. 2007. V. 180. P. 2558 – 2565.
19. Valant M. Dielectric relaxations in Bi2O3–Nb2O5–NiO cubic pyrochlores // J. Am. Ceram. Soc. 2009. V. 92. P. 955 – 958.
20. Rylchenko E. P., Makeev B. A., Sivkov D. V., et al. Features of phase formation of pyrochlore-type Bi2Cr1/6Mn1/6Fe1/6Co1/6Ni1/6Cu1/6Ta2O9+? // Lett. Mater. 2022. V. 12 P. 486 – 492.
21. Sun S. H., Xue Y., Yang D., et al. Bismuth pyrochlores with varying Fe/Co ratio for efficient multi-functional catalysis: structure evolution versus photo- and electro-catalytic activities // Chem. Engin. J. 2022. V. 448. P. 137580.
22. Piir I. V., Prikhodko D. A., Ignatchenko S. V., Schukariov A. V. Preparation and structural investigations of the mixed bismuth niobates, containing transition metals // Sol. St. Ion. 1997. V. 101 – 103. P. 1141 – 1146.
23. Zhuk N. A., Krzhizhanovskaya M. G., Sekushin N. A., et al. Novel Ni-doped bismuth–magnesium tantalate pyrochlores: structural and electrical properties, thermal expansion, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectra // ACS Omega. 2021. V. 6. P. 23262 – 23273.
24. Lasia А. Electrochemical impedance spectroscopy and its applications. New York: Springer Science+Business Media, 2014. P. 369.
25. Barsoukov E., Macdonald J. R. Impedance spectroscopy: theory, experiment and application // Wiley – Interscience. 2005. P. 606.
The article can be purchased
electronic!
PDF format
700 руб
DOI: 10.14489/glc.2026.05.pp.010-017
Article type:
Research Article
Make a request
