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Journal of Structural Chemistry

, Volume 59, Issue 7, pp 1631–1638 | Cite as

Phase Transformations in the Mn–Ga–O System Depending on the Preparation Conditions

  • O. S. VenediktovaEmail author
  • O. A. Bulavchenko
  • T. N. Afonasenko
  • P. G. Tsysul’nikov
  • E. Yu. Gerasimov
  • S. V. Tsybulya
Article
  • 6 Downloads

Abstract

Manganese-gallium samples with cation ratios Mn:Ga = 1:2, 1.5:1.5, and 2:1 are synthesized by coprecipitation with subsequent annealing in air in a temperature range 600–1200 °C. Powder XRD, TEM, and BET methods are used to study the physicochemical characteristics of the samples. It is found that in the air at the annealing temperature of 600 °C finely dispersed low-temperature Mn3–xGaxO4 spinels primarily form in all series, but in the whole temperature range (600–1200 °C) the system is multiphase. Annealing at 800–1200 °C leads to an increase in the concentration of simple oxides (β-Mn3O4 and β-Ga2O3). Only simple α-Mn2O3 and β-Ga2O3 oxides exist in a Mn:Ga = 2:1 series at 800 °C. In the sample with a cation ratio Mn:Ga = 1.5:1.5 annealed in air at 1000 °C, the formation of a superstructure based on the spinel structure is found.

Keywords

phase transformations manganese-containing double oxides manganese-gallium spinel powder X-ray diffraction 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • O. S. Venediktova
    • 1
    • 2
    Email author
  • O. A. Bulavchenko
    • 1
    • 2
  • T. N. Afonasenko
    • 3
  • P. G. Tsysul’nikov
    • 3
  • E. Yu. Gerasimov
    • 1
    • 2
  • S. V. Tsybulya
    • 1
    • 2
  1. 1.Boreskov Institute of Catalysis, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia
  3. 3.Institute of Hydrocarbon Processing, Siberian BranchRussian Academy of SciencesOmskRussia

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