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以菱镁矿风化石与工业氧化铝为原料,按照尖晶石理论组成对两种物料进行配料,添加不同数量的氧化镧,分析研究氧化镧对以菱镁矿风化石为原料制备的镁铝尖晶石组成结构、结晶度、晶胞常数的影响,用XRD分析法和SEM法对烧后试样的相组成和显微结构进行研究。利用X’Pert Plus软件对试样中结晶相的相对结晶度进行计算,并对镁铝尖晶石相的晶胞常数进行分析。结果表明,以菱镁矿风化石为主要原料制备出的镁铝尖晶石材料中主晶相镁铝尖晶石的晶胞常数随着氧化镧加入量增加而增大。当氧化镧加入量为0.8%～1.0%时,镁铝尖晶石晶胞常数增加趋势减弱。加入氧化镧可以提高材料中结晶相结晶度,当氧化镧加入量达到0.8%时,材料中结晶相结晶度是未加入氧化镧的1.1667倍。结构中镁铝尖晶石的分布更为均匀。
Magnesite feldspar and industrial alumina were used as raw materials to prepare two kinds of materials according to the theoretical composition of spinel. Different amounts of lanthanum oxide were added to study the effect of lanthanum oxide on the formation of magnesia Spinel structure, crystallinity and unit cell constants. The phase composition and microstructure of the sintered samples were studied by XRD and SEM. The relative crystallinity of the crystalline phase in the sample was calculated using X’Pert Plus software and the unit cell constants of the spinel phase were analyzed. The results show that the unit cell constant of the main crystalline Mg-Al spinel in Mg-Al spinel prepared from magnesite fossils is increased with the addition of lanthanum oxide. When the amount of lanthanum oxide is 0.8% ~ 1.0%, the unit cell constant of Mg-Al spinel tends to increase. The addition of lanthanum oxide can increase the crystallinity of the crystalline phase. When the amount of lanthanum oxide is up to 0.8%, the crystallinity of the crystalline phase in the material is 1.1667 times that of lanthanum oxide. Structure of magnesium aluminum spinel distribution more evenly.