Synthesis and Characterization of Mixed Manganese-Gallium Oxides Mn3-xGaxO4 (x = 1–2) with the Spinel Structure Full article
| Journal |
Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669 |
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| Output data | Year: 2017, Volume: 725, Pages: 496-503 Pages count : 8 DOI: 10.1016/j.jallcom.2017.07.175 | ||||||
| Tags | In situ XRD, Material synthesis, Phase transformations, Spinel manganese-gallium oxides, Spinels | ||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 14-23-00037 |
Abstract:
Manganese-gallium oxide samples with the cationic ratio Mn:Ga = 2:1, 1.7:1.3, 1.5:1.5, 1.3:1.7 and 1:2 were synthesized via coprecipitation followed by calcination in argon over a wide temperature range, 600–1200 °C. Physicochemical characteristics of the samples were examined by means of XRD, BET, TG with mass spectroscopy, and IR spectroscopy. The XRD, IR spectroscopy showed that the Mn3-хGaхO4 mixed oxides with the spinel structure are formed in the entire temperature range, 600–1200 °C. Samples with a cation ratio Mn:Ga = 1.7:1.3, 1.5:1.5 at 1000–1200°С and Mn:Ga = 1.3:1.7 at 1200°С are single-phase ones according to XRD. The cation distribution over tetrahedral and octahedral spinel positions was obtained by the Rietveld method. The spinel phases synthesized at 600 °C (low-temperature samples) are nanocrystalline and have CSR sizes of 10–15 nm. Ex situ and in situ XRD, TG with mass spectroscopy studies revealed that low- and high-temperature Mn3-хGaхO4 oxides substantially differ from each other. Strongly differing unit cell parameters of the spinel phase in low- (600–800 °C) and high-temperature (1000–1200 °C) samples were revealed. The presence of excess oxygen in low-temperature Mn3-хGaхO4 phases was supposed. In situ XRD in flowing helium and TG with mass spectroscopy demonstrated a two-step loss of oxygen.
Cite:
Venediktova O.S.
, Bulavchenko O.A.
, Afonasenko T.N.
, Tsyrul'nikov P.G.
, Vinokurov Z.S.
, Chesalov Y.A.
, Tsybulya S.V.
Synthesis and Characterization of Mixed Manganese-Gallium Oxides Mn3-xGaxO4 (x = 1–2) with the Spinel Structure
Journal of Alloys and Compounds. 2017. V.725. P.496-503. DOI: 10.1016/j.jallcom.2017.07.175 WOS Scopus РИНЦ ANCAN OpenAlex
Synthesis and Characterization of Mixed Manganese-Gallium Oxides Mn3-xGaxO4 (x = 1–2) with the Spinel Structure
Journal of Alloys and Compounds. 2017. V.725. P.496-503. DOI: 10.1016/j.jallcom.2017.07.175 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jun 5, 2017 |
| Accepted: | Jul 17, 2017 |
| Published online: | Jul 20, 2017 |
| Published print: | Nov 1, 2017 |
Identifiers:
| Web of science: | WOS:000412332900057 |
| Scopus: | 2-s2.0-85025436451 |
| Elibrary: | 31073035 |
| Chemical Abstracts: | 2017:1247459 |
| Chemical Abstracts (print): | 167:590446 |
| OpenAlex: | W2737199102 |