MgAl2O4-γ-Al2O3 solid solution interaction: Mathematical framework and phase separation of α-Al2O3 at high temperature

被引：8

作者：

Pal S. ^{[1
]}

Bandyopadhyay A.K. ^{[1
]}

Mukherjee S. ^{[2
]}

Samaddar B.N. ^{[3
]}

Pal P.G. ^{[1
]}

机构：

[1] Department of Ceramic Technology, Government College of Engineering and Ceramic Technology

[2] School of Materials Science and Nanotechnology, Department of Metallurgical and Material Engineering, Jadavpur University

[3] AICTE, Department of Metallurgical and Material Engineering, Jadavpur University

来源：

Bulletin of Materials Science | 2011年 / 34卷 / 4期

关键词：

Phase transformation; Solid solution; X-ray diffraction;

D O I：

10.1007/s12034-011-0206-1

中图分类号：

学科分类号：

摘要：

Although existence of MgAl2O4-γ-Al2O 3 solid solution has been reported in the past, the detailed interactions have not been explored completely. For the first time, we report here a mathematical framework for the detailed solid solution interactions of γ-Al2O3 in MgAl2O4 (spinel). To investigate the solid solubility of γ-Al2O3 in MgAl2O4, Mg-Al spinel (MgO-nAl2O3; n = 1, 1·5, 3, 4·5 and an arbitrary high value 30) precursors have been heat treated at 1000°C. Presence of only non-stoichiometric MgAl 2O4 phase up to n = 4·5 at 1000°C indicates that alumina (as γ-Al2O3) present beyond stoichiometry gets completely accommodated in MgAl2O4 in the form of solid solution. γ → a alumina phase transformation and its subsequent separation from MgAl2O4 has been observed in the Mg-Al spinel powders (n > 1) when the 1000°C heat treated materials are calcined at 1200°C. In the mathematical framework, unit cell of MgAl 2O4 (Mg8Al16O32) has been considered for the solid solution interactions (substitution of Mg2+ ions by Al3+ ions) with γ-Al2O3. It is suggested that combination of unit cells of MgAl2O4 takes part in the interactions when n > 5 (MgO-nAl2O3). © Indian Academy of Sciences.

引用

页码：859 / 864

页数：5

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