CAJ | 학술논문

采用硬脂酸凝胶法制备了CeO2纳米晶。XRD分析表明，当焙烧温度为450～900℃时，所合成的CeO2纳米晶均属于单相立方晶系，空间群为O5H-FM3M；计算表明，随焙烧温度的升高，平均晶粒度增大，而平均晶格畸变率则随平均晶粒度的增大而减小，表明粒子越小，晶格畸变越大，晶粒发育越不完整。TEM分析表明，CeO2纳米晶呈球形，粒度随焙烧温度的增加而增大。热失重分析表明，当焙烧温度高于750℃时，CeO2中的杂质基本挥发完毕。相对密度分析表明，随CeO2纳米晶粒度的增大，粉末的密度增加。
채용경지산응효법제비료CeO2납미정。XRD분석표명，당배소온도위450～900℃시，소합성적CeO2납미정균속우단상립방정계，공간군위O5H-FM3M；계산표명，수배소온도적승고，평균정립도증대，이평균정격기변솔칙수평균정립도적증대이감소，표명입자월소，정격기변월대，정립발육월불완정。TEM분석표명，CeO2납미정정구형，립도수배소온도적증가이증대。열실중분석표명，당배소온도고우750℃시，CeO2중적잡질기본휘발완필。상대밀도분석표명，수CeO2납미정립도적증대，분말적밀도증가。
CeO2 nanocrystalline particulates of different sizes were prepared by stearic acid gel method.XRD patterns showed that the synthesized CeO2 was cubic in structure with single-phase when calcination temperature was 450-900℃,space group was O5H-FM3M.Calcination revealed that the mean crystalline size increased with the increase of calcinstion temperature,but average crystal lattice distortion rate decreased with the increasing in the average crystalline size.This indicated that the smaller the particle size,the bigger crystal lattice distortion,the worse the crystal growed.TEM photos revealed that CeO2 particles were spherical in shape,and the mean sizes of the C eO2 particles increased with the increase of calcination temperatures.Weight loss analysis indicated that the impurity in CeO2 completely volatilized when calcination temperature was above 750℃.The density of nanocrystalline CeO2 powders analysis showed that the density of CeO2 nanocrystalline powders increased with the increasing in CeO2 particles sizes.