摘要
通过非均相沉淀法合成ZnO/CeO_2复合纳米材料,并利用XRD粉末衍射法对其进行物相分析、Rietveld全谱拟合法对其进行结构精修。拟合结果表明,该法制备样品为六方相ZnO与立方相CeO_2混合相,平均晶粒尺寸分别为20.0nm和6.9nm,质量分数分别为28.2%及71.8%。精修结果的数值判据为Rwp=5.95%、Rexp=4.06%、GOF=1.47,数值均在正常范围且计算结果可靠。TEM表征进一步证明计算结果可靠。研究结果表明,Rietveld全谱拟合法在研究复合纳米材料的物相比与晶粒大小时更加合理。
ZnO/CeO2 nanocompositcs were prepared by heterogeneous precipitation method. The phase composition was dctcrminccM〕y XRD method,and analyzxd by Rietveld refinement method. The refinement results show that the sample is made up of a mixture of hexagonal ZnO and cubic CcO2 . rhe average crystallite sizes arc 20.0 nm and 6.9 nm〉 and the mass fractions arc 28.2% and 71.8% , respectively. The reliability factors of the refinements arc Rwp = 5.95 % ,Rexp = 4.06 %,GOF = 1,47 . The reliability of results is further proved by analysis. It is showed that Rietveld analysis is scientific and reliable in thestudy of phase ratio and grain size of nanocomposites.
出处
《石油化工高等学校学报》
CAS
2017年第1期14-17,共4页
Journal of Petrochemical Universities
基金
辽宁省教育厅科学技术研究一般项目(L2016019)
