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


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Article Info

DATE

2018-12-28

AUTHORS

O. S. Venediktova, O. A. Bulavchenko, T. N. Afonasenko, P. G. Tsysul’nikov, E. Yu. Gerasimov, S. V. Tsybulya

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. More... »

PAGES

1631-1638

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0022476618070156

DOI

http://dx.doi.org/10.1134/s0022476618070156

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1110647480


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