摘要
以分析纯氧化铁、氧化铝和二氧化钛为原料,按FeO∶Al2O3质量比为40.8∶59.2配料,并于合成体系中分别引入质量分数为0、1%、3%和5%的二氧化钛。在保护气氛(CO2/CO)下于1550℃煅烧4h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:在铁铝尖晶石合成过程中,引入的TiO2参与了铁铝尖晶石的结晶、长大;添加TiO2的铁铝尖晶石衍射峰向小角度偏移,晶格常数增大。TiO2加入量小于1%时,各试样的微观结构都比较均匀,引入的TiO2进入了铁铝尖晶石的晶格,且以复合尖晶石的形式存在;TiO2添加量大于3%时,烧后试样的结晶形貌发生明显变化,铁铝尖晶石发生分解。
The analytical pure Fe2O3,Al2O3 and TiO2 powder as raw materials with different ratios of x（ x= w（ TiO2） /w（ Fe O ＋ Al2O3））（ i. e.,x = 0,1,3,5） were firstly mixed,and then the mixture was sintered in protective atmosphere（ CO2/ CO） at 1550 ℃ for 4 h. The sintered samples were analyzed by X-ray diffraction,scanning electron microscopy and energy dispersive spectrometry,respectively. The results show that the diffraction peaks of these samples with TiO2 addition are consistent with that of hercynite,causing the increase of the lattice constant. When the mass percentage of TiO2 addition is 1%,the sintered samples all possess a homogenous structure,and the introduction of TiO2 enters into the crystal lattice of hercynite and exists in the form of composite spinel. When the mass percentage of TiO2 addition is 1%,the crystal morphology of the sintered samples is differentand the decomposition of hercynite takes place.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第2期346-349,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金(51172021)
国家科技支撑计划(2013BAF09B01)
