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RAS Chemistry & Material ScienceЭлектрохимия Russian Journal of Electrochemistry

  • ISSN (Print) 0424-8570
  • ISSN (Online) 3034-6185

DIELECTRIC RELAXATION AND PROTON CONDUCTIVITY OF SUBSTITUTIONAL SOLID SOLUTIONS AND COMPOSITES BASED ON POLYANTIMONIC ACID CONTAINING NIOBIUM (5+) IONS

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PII
S3034618525080076-1
DOI
10.7868/S3034618525080076
Publication type
Article
Status
Published
Authors
L.Yu. Kovalenko
  • Affiliation: Chelyabinsk State University
E.A. Belyaeva
  • Affiliation: Chelyabinsk State University
E.S. Karabelnikova
  • Affiliation: Chelyabinsk State University
D.S. Ryashentsev
  • Affiliation: Chelyabinsk State University
D.A. Zakharyevich
  • Affiliation: Chelyabinsk State University
V.A. Burmistrov
  • Affiliation: Chelyabinsk State University
V.E. Zhivulin
  • Affiliation: South Ural State University (National Research University)
Volume/ Edition
Volume 61 / Issue number 8
Pages
422-432
Abstract
The study is devoted to the synthesis of substitution solid solutions based on polyantimonic acid HSbNbO·HO, ≥ 1, and composites HSbNbO·0.5yNbO·HO, ≥ 1, which have potential for use as components of low temperature fuel cell membranes. The samples were synthesised by the co-precipitation method. The dopant chosen was Nb ions, which have a radius and electronegativity similar to those of Sb ions. The elemental composition of the samples (Nb/Sb ratio) was refined by X-ray fluorescence analysis and the limiting dopant concentration - HSbNbO·HO, ≥ 1 - was determined by X-ray phase analysis. Further increase of x leads to the formation of two-phase samples: substitution solid solutions with pyrochlore type structure and amorphous niobic acid. X-ray diffraction analysis using the Rietveld method was carried out on the substitution solid solutions, and the lattice parameter of the pyrochlore type structure was refined. The introduction of Nb ions leads to an increase in the crystal lattice parameter for samples 0 < x ≤ 0.4. The analysis of the dielectric properties and the proton conductivity of the samples at a temperature of 25°C, relative humidity of 58% showed that the sample x = 0.6 has the best transport properties. The value of proton conductivity for the sample x = 0.6 is 11.5·10 S/m, for polyantimonic acid and the limiting dopant concentration solid solution (x = 0.4) - 7.2·10 S/m and 5.0·10 S/m respectively. When discussing the results, a possible mechanism of proton conductivity in the samples is given: correlated proton transport along a certain chain of hydrogen bonds through the channels of the pyrochlore structure and through the intergranular space where adsorbed water molecules and niobic acid particles are located.
Keywords
полисурьмяная кислота ниобиевая кислота твердые растворы замещения структура типа пирохлора протонная проводимость
Date of publication
25.02.2026
Year of publication
2026
Number of purchasers
0
Views
13

References

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