Phase Transformations in the Mn–Ga–O System Depending on the Preparation Conditions
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Journal |
Journal of Structural Chemistry
ISSN: 0022-4766
, E-ISSN: 1573-8779
|
| Output data |
Year: 2018,
Volume: 59,
Number: 7,
Pages: 1631-1638
Pages count
: 8
DOI:
10.1134/s0022476618070156
|
| Tags |
phase transformations, manganese-containing double oxides, manganese-gallium spinel, powder X-ray diffraction |
| Authors |
Venediktova O. S.
1,2
,
Bulavchenko O. A.
1,2
,
Afonasenko T. N.
3
,
Tsysul’nikov P. G.
3
,
Gerasimov E. Yu.
1,2
,
Tsybulya S. V.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
|
| 2 |
Novosibirsk State University, Russia
|
| 3 |
Institute of Hydrocarbon Processing, Siberian Branch, Russian Academy of Sciences, Omsk, Russia
|
|
Funding (1)
|
1
|
Federal Agency for Scientific Organizations
|
0303-2016-0002
|
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.