Influence of the temperature and duration of the annealing on the lattice structure and growth of the Mg-Al spinel layer |
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Authors: | Hailiang ZhangMingfu Zhang Jiecai HanGuobing Ying Huaixin GuoChenghai Xu Haitao ShenNingning Song |
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Affiliation: | Center for Composite Materials, Harbin Institute of Technology, Harbin, China |
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Abstract: | In this paper, MgO film is successfully grown on polycrystalline and monocrystalline alumina substrates using sol-gel method, and polycrystalline and monocrystalline Mg-Al spinels are fabricated by solid state reaction, respectively. The influence of annealing temperature and time on the lattice structure and growth of the formed Mg-Al spinel layer has been investigated. It is indicated that the annealing temperature and time on the as-synthesized polycrystalline Mg-Al spinel has more significant influence than that of single crystal Mg-Al spinel. The thickness of the Mg-Al spinel layer increases with the annealing temperature, both for polycrystalline and for monocrystalline alumina substrates. And the significantly intercrystalline diffusion of Mg2+ ions and Al3+ ions results in a quicker growth velocity of the Mg-Al spinel layer than that of intracrystalline diffusion. |
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Keywords: | Alumina Mg-Al spinel Diffusion Solid state reaction |
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