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

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

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

2 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)1631-1638
Число страниц8
ЖурналJournal of Structural Chemistry
Том59
Номер выпуска7
DOI
СостояниеОпубликовано - 1 дек 2018

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