High-temperature X-ray study of the formation and delamination of manganese-alumina spinel Mn<Subscript>1.5</Subscript>Al<Subscript>1.5</Subscript>O<Subscript>4</Subscript>期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

High-temperature X-ray study of the formation and delamination of manganese-alumina spinel Mn1.5Al1.5O4

Authors:	O. A. Bulavchenko S. V. Tsybulya S. V. Cherepanova T. N. Afonasenko P. G. Tsyrulnikov

Affiliation:	(1) G. K. Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia;(2) Novosibirsk State University, Novosibirsk, Russia;(3) Institute of Processing of Hydrocarbons, Siberian Division, Russian Academy of Sciences, Omsk, Russia

Abstract:	The behavior of the manganese-alumina system with Mn:Al = 1:1 on heating in air and vacuum was studied. The starting samples were mixtures of β-Mn₃O₄, α-Mn₂O₃, and γ-Al₂O₃. On heating to 950°C in air, the samples were partially oxidized into α-Mn₂O₃, and corundum α-Al₂O₃ formed along with mixed manganese-alumina cubic spinel, whose composition was close to Mn₂AlO₄. In vacuum at 1200°C, the starting sample with a ratio of Mn:Al = 1:1 transformed into the manganese-alumina spinel Mn_1.5Al_1.5O₄, which retained its cubic structure after slow cooling in vacuum. When cooled in air, this solid solution delaminated, and a nanocrystalline Mn_2.8Al_0.2O₄ phase formed, whose structure was β-Mn₃O₄ type tetragonal spinel.

Keywords:	high-temperature X-ray diffraction manganese-alumina systems phase transformations
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