硅酸盐学报

MgO 含量对铁铝尖晶石晶体结构的影响

作者：陈俊红闫明伟宿金栋李斌李勇孙加林

关键词：氧化镁铁铝尖晶石晶体结构结晶形貌

分类号：TQ175

出版年,卷(期):页码：2015,43(9):1284-1288

DOI：10.14062/j.issn.0454-5648.2015.09.18

摘要：

以分析纯的氧化铁、氧化铝和氧化镁为原料，FeO 与Al2O3 质量比为40.8: 59.2 配料，在合成体系中分别引入质量分数为0、1%、3%、5%、7%、9%和11%的氧化镁，在CO2/CO 保护气氛下于1 600 ℃煅烧 4 h，固相合成铁铝尖晶石。用X射线衍射、扫描电子显微镜和能谱对烧后试样进行分析。结果表明：相比于未添加MgO 的试样，添加MgO 的铁铝尖晶石衍射峰发生偏移，晶格常数随之变化；试样微观结构都比较均匀，引入的MgO 进入铁铝尖晶石晶格，以复合尖晶石形式存在。当MgO 添加量大于5%时，衍射峰的偏移出现拐点，且烧结后试样的结晶形貌发生明显变化。

The analytical pure Fe2O3, Al2O3 and MgO powders as raw materials with different ratios of x (x=w(MgO)/w(FeO+Al2O3))were firstly mixed, and then the mixture was sintered in protective atmosphere (CO2/CO) at 1 600 ℃ for 4 h. The sintered sampleswere analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry, respectively. The results showthat the diffraction peaks of these samples with MgO addition appear, causing the change of the lattice constant. The sintered samplesall possess a homogenous structure, and the introduction of MgO enters into the crystal lattice of hercynite and exists in the form ofcomposite spinel. When the mass fraction of MgO is >5%, the migration of diffraction peaks appears to be a turning-point and thecrystal morphology of the sintered samples is different.

基金项目：

国家自然科学基金(51172021)；国家科技支撑计划(2013BAF09B01)资助。

作者简介：

第一作者：陈俊红(1971—)，男，副教授。E–mail: cjh2666@126.com

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