Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Synthesis and characterization of mixed manganese-gallium oxides Mn3-xGaxO4 (x = 1–2) with the spinel structure. / Venediktova, O. S.; Bulavchenko, O. A.; Afonasenko, T. N. и др.
в: Journal of Alloys and Compounds, Том 725, 25.11.2017, стр. 496-503.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Synthesis and characterization of mixed manganese-gallium oxides Mn3-xGaxO4 (x = 1–2) with the spinel structure
AU - Venediktova, O. S.
AU - Bulavchenko, O. A.
AU - Afonasenko, T. N.
AU - Tsyrul'nikov, P. G.
AU - Vinokurov, Z. S.
AU - Chesalov, Yu A.
AU - Tsybulya, S. V.
PY - 2017/11/25
Y1 - 2017/11/25
N2 - 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.
AB - 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.
KW - In situ XRD
KW - Material synthesis
KW - Phase transformations
KW - Spinel manganese-gallium oxides
KW - Spinels
KW - MNIN2O4 SPINEL
KW - WIDE-BAND-GAP
KW - CO OXIDATION
KW - POLYMORPHS
KW - MGGA2O4
KW - ZNGA2O4
KW - MNOX/AL2O3
KW - SPECTRA
KW - MNGA2O4
KW - CATALYSTS
UR - http://www.scopus.com/inward/record.url?scp=85025436451&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2017.07.175
DO - 10.1016/j.jallcom.2017.07.175
M3 - Article
AN - SCOPUS:85025436451
VL - 725
SP - 496
EP - 503
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -
ID: 10071408