Sc2W3O12的低温制备及其负热膨胀性能研究  

Low temperature synthesis and negative thermal expansion of Sc2W3O12

作　　者：张志萍[1] 袁晖 雷洋 邱建春 张芳[3] 刘红飞[2] ZHANG Zhiping;YUAN Hui;LEI Yang;QIU Jianchun;ZHANG Fang;LIU Hongfei(Guangling College, Yangzhou University, Yangzhou 225000, China;School of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China;School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430200, China)

机构地区：[1]扬州大学广陵学院,江苏扬州225000 [2]扬州大学物理科学与技术学院,江苏扬州225009 [3]武汉工程大学材料科学与工程学院,武汉430200

出　　处：《功能材料》2021年第1期1127-1132,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51602280,51102207);江苏省高等学校大学生创新创业训练计划资助项目(201913987005Y)。

摘　　要：采用化学共沉淀法低温制备了Sc2W3O12粉体。利用综合热分析仪(TG-DSC)、X射线衍射仪(XRD)、拉曼光谱仪(Raman)、高分辨透射电子显微镜(HRTEM)、能谱仪(EDX)、扫描电子显微镜(SEM)分析了制备样品的物相组成、晶体结构和微观形貌;利用变温X射线衍射仪研究了样品的负热膨胀性能。研究结果表明,在溶液pH=7左右时,共沉淀合成的前驱体经200℃烘干后制备得到斜方相Sc2W3O12粉体,实现低温制备,具有较高的纯度,在25~500℃温度范围内,表现出各向异性的负热膨胀特性,其沿a,b和c轴的热膨胀系数分别为s-8.21×10^-6℃^-1,1.13×10^-6℃^-1和-6.05×10^-6℃^-1,本征热膨胀系数αV=-13.12×10^-6℃^-1,线性热膨胀系数αl=-4.37×10^-6℃^-1(αv=3αl)。Sc2W3O12 powder was synthesized at low temperature visa chemical co-precipitation method.The phase composition,crystal structure and morphology of the samples were investigated by using the thermogravimetry(TG),differential scanning calorimeter(DSC),X-ray diffractometer(XRD),Raman spectrometer(Raman),high resolution transmission electron microscope(TEM),energy dispersive X-ray spectroscopy(EDX)and scanning electron microscope(SEM),respectively.The negative thermal expansion properties of Sc2W3O12 were analyzed by using the high-temperature XRD.The results indicate that orthorhombic Sc2W3O12 was successfully synthesized by heating the precursor at 200℃,and the precursor was prepared in the solution with a pH value of 7.Low temperature synthesis of Sc2W3O12 with high purity was realized through co-precipitation method.Sc2W3O12 showed anisotropic negative thermal expansion properties in 25-500℃,and the coefficients of thermal expansion(CTEs)along a,b and c axes were-8.21×10^-6℃^-1,1.13×10^-6℃^-1 and-6.05×10^-6℃^-1,respectively.The intrinsic volumetric CTE(αV)was-13.12×10^-6℃^-1,and the linear CTE(αl)was-4.37×10^-6℃^-1(αV=3αl).

关 键 词：负热膨胀 钨酸钪 低温合成 共沉淀法 

分 类 号：TQ174[化学工程—陶瓷工业]