节点文献
共沉淀法制备不同粒径的ZrW2O8粉体及其负热膨胀特性的分析（英文）
Synthesize ZrW2O8 powders with different particle size by co-precipitation method and characterize the negative thermal expansion property
【Author】 SUN Xiu-juan YANG Juan LIU Qin-qin CHENG Xiao-nong (School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)
【机构】 江苏大学材料科学与工程学院；
【摘要】 以共沉淀法制备 ZrW2O8粉体并考察粉体粒径与热膨胀性能之间的关系．对其前驱体进行热重-差热分析 （TG-DSC）,以 X 射线粉末衍射（XRD）、透射电镜（TEM）、扫描电子显微镜（SEM）分别对粉体进行物相分析和形貌观测．结果表明所得粉体为单一立方结构．当 nPEG/nmetal为0．032时,得到的 ZrW2O8粉体颗粒达到0．4μm×0．4μm．晶格常数受颗粒大小的影响较显著,但当颗粒大小变化较小时,热膨胀系数基本不变．
【Abstract】 To describe the effect of particle size on thermal expansion coefficient,ZrW2O8 powders with different panicle size were synthesized by co-precipitation method.The precursor of ZrW2O8 was studied by thermogravimetric and differential scanning calorimetry method（TG-DSC）.The structure and morphology of the resulting products were characterized by powder X-ray diffraction （XRD）and scanning electron microscopy（SEM）respectively.Results exhibited that the samples were single cubic phase.When the value of nPEG/nmetalwas 0.032,the smallest ZrW2O8 particle with an average dimension of 0.4μm×0.4μm were obtained.The lattice constant was obviously influenced by particle size,but the negative thermal coefficient was about the same(—6.01×10-6K)when particle size was in micrometer range and differed not too much.
【Key words】 ZrW2Os powders； co-precipitation； polyethylene glycol(PEG)； lattice constant； negative thermal expansion；
- 【会议录名称】 第六届中国功能材料及其应用学术会议论文集（8）
- 【会议名称】第六届中国功能材料及其应用学术会议
- 【会议时间】2007-11
- 【会议地点】中国湖北武汉
- 【分类号】TB383.3
- 【主办单位】重庆仪器材料研究所、中国仪器仪表学会仪表材料分会、国家仪表功能材料工程技术研究中心