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RAS Chemistry & Material ScienceЭлектрохимия Russian Journal of Electrochemistry

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

High-entropy columbites: structure, optical and electrical properties

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PII
S0424857025030018-1
DOI
10.31857/S0424857025030018
Publication type
Article
Status
Published
Authors
M. S. Koroleva
  • Affiliation: ITMO University
I. V. Piir
  • Affiliation: Institute of Chemistry FRC Komi SC UB RAS
Volume/ Edition
Volume 61 / Issue number 3
Pages
172-179
Abstract
A high-entropy composition (Mg0.2Zn0.2Ni0.2Co0.2Mn0.2)Nb2O6 with a columbite structure and its Ti-substituted composition (5%) were synthesized. The synthesis was carried out using a modified method of combustion solutions followed by high-temperature sintering. X-ray analysis and scanning electron microscopy were used for characterization of the ceramics. According to diffuse reflectance spectra, the band gap of direct electronic transitions was calculated (Egdir ≈ 2.98–3.05 eV). Solid solutions are characterized predominantly by electronic conductivity. Substitution of niobium cations with titanium leads to an increase in conductivity by 1.2 orders of magnitude in the temperature range 160–750°C.
Keywords
высокоэнтропийный состав структура колумбита ширина запрещенной зоны проводимость
Date of publication
17.09.2025
Year of publication
2025
Number of purchasers
0
Views
15

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