Synthesis and Properties of Bi1.8Mn0.5Ni0.5Ta2O9-Δ Pyrochlore

Nekipelov, Sergey V.; Petrova, Olga V.; Koroleva, Alexandra V.; Krzhizhanovskaya, Mariya G.; Parshukova, Kristina N.; Sekushin, Nikolay А.; Makeev, Boris A.; Zhuk, Nadezhda A.

doi:10.3390/chemistry7040119

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Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore

by

Sergey V. Nekipelov

^1,*

,

Olga V. Petrova

¹

,

Alexandra V. Koroleva

²

,

Mariya G. Krzhizhanovskaya

³,

Kristina N. Parshukova

⁴,

Nikolay А. Sekushin

⁵,

Boris A. Makeev

⁶

and

Nadezhda A. Zhuk

⁷

¹

Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina st. 4, Syktyvkar 167982, Russia

²

Institute of Physics, Saint Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia

³

Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia

⁴

Institute of Natural Sciences, Saint Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia

⁵

Institute of Chemistry of the Komi Science Center UB RAS, Pervomayskaya st. 48, Syktyvkar 167982, Russia

⁶

Institute of Geology of the Komi Science Center UB RAS Pervomayskaya st. 52, Syktyvkar 167982, Russia

⁷

Institute of Natural Sciences, Syktyvkar State University, Oktyabrsky Prospect, 55, Syktyvkar 167001, Russia

^*

Author to whom correspondence should be addressed.

Chemistry 2025, 7(4), 119; https://doi.org/10.3390/chemistry7040119

Submission received: 17 June 2025 / Revised: 17 July 2025 / Accepted: 22 July 2025 / Published: 25 July 2025

(This article belongs to the Section Inorganic and Solid State Chemistry)

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Abstract

Pyrochlore Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ (sp.gr. Fd-3m, a = 10.5038(9) Å) was synthesized by the solid-phase reaction method and characterized by vibrational and X-ray spectroscopy. According to scanning electron microscopy, the ceramics are characterized by a porous microstructure formed by randomly oriented oblong grains. The average crystallite size determined by X-ray diffraction is 65 nm. The charge state of transition element cations in the pyrochlore was analyzed by soft X-ray spectroscopy using synchrotron radiation. For mixed pyrochlore, a characteristic shift of Bi4f and Ta4f and Ta5p spectra to the region of lower energies by 0.25 and 0.90 eV is observed compared to the binding energy in Bi₂O₃ and Ta₂O₅ oxides. XPS Mn2p spectrum of pyrochlore has an intermediate energy position compared to the binding energy in MnO and Mn₂O₃, which indicates a mixed charge state of manganese (II, III) cations. Judging by the nature of the Ni2p spectrum of the complex oxide, nickel ions are in the charge state of +(2+ζ). The relative permittivity of the sample in a wide temperature (up to 350 °С) and frequency range (25–10⁶ Hz) does not depend on the frequency and exhibits a constant low value of 25. The minimum value of 4 × 10⁻³ dielectric loss tangent is exhibited by the sample at a frequency of 10⁶ Hz. The activation energy of conductivity is 0.7 eV. The electrical behavior of the sample is modeled by an equivalent circuit containing a Warburg diffusion element.

Keywords: impedance spectroscopy; XPS.; NEXAFS; transition elements; electrical properties

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MDPI and ACS Style

Nekipelov, S.V.; Petrova, O.V.; Koroleva, A.V.; Krzhizhanovskaya, M.G.; Parshukova, K.N.; Sekushin, N.А.; Makeev, B.A.; Zhuk, N.A. Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore. Chemistry 2025, 7, 119. https://doi.org/10.3390/chemistry7040119

AMA Style

Nekipelov SV, Petrova OV, Koroleva AV, Krzhizhanovskaya MG, Parshukova KN, Sekushin NА, Makeev BA, Zhuk NA. Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore. Chemistry. 2025; 7(4):119. https://doi.org/10.3390/chemistry7040119

Chicago/Turabian Style

Nekipelov, Sergey V., Olga V. Petrova, Alexandra V. Koroleva, Mariya G. Krzhizhanovskaya, Kristina N. Parshukova, Nikolay А. Sekushin, Boris A. Makeev, and Nadezhda A. Zhuk. 2025. "Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore" Chemistry 7, no. 4: 119. https://doi.org/10.3390/chemistry7040119

APA Style

Nekipelov, S. V., Petrova, O. V., Koroleva, A. V., Krzhizhanovskaya, M. G., Parshukova, K. N., Sekushin, N. А., Makeev, B. A., & Zhuk, N. A. (2025). Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore. Chemistry, 7(4), 119. https://doi.org/10.3390/chemistry7040119

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Synthesis and Properties of Bi_1.8Mn_0.5Ni_0.5Ta₂O_9-Δ Pyrochlore

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