【作者】 程晓农； 刘芹芹； 杨娟； 孙秀娟；

【Author】 CHENG Xiao-nong LIU Qin-qin YANG Juan SUN Xiu-juan (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】 采用水热法,以（NH₄）₂ HPP₄为表面活性剂成功合成了花状立方相ZrWMoO₈粉体。以X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶红外光谱（FT-IR）和热重-差热分析（TG-DSC）对产物结构及形貌进行了表征,以变温X射线衍射分析测定粉体的负热膨胀特性。结果表明,花状ZrWMoO₈是由纳米棒团聚而成,其在室温～120℃温度区间内体现正热膨胀特性,在120℃脱除水分子之后,体现负热膨胀特性,在120～700℃温度区间内,其热膨胀系数为—4.02×10^-6/K。更多还原

【Abstract】 Flowerlike cubic ZrWMoO₈ powders were prepared via hydrothermal method using （NH4）2HPO4 as surfactant.The structures and morphologies of the resulting powders were characterized by Powder X-ray dif- fraction （XRD）,Scanning electron microscopy （SEM）,Transmission electron microscopy （TEM）,Fourier transform infrared absorption spectra （FTIR）,Thermogravimetric and differential scanning calorimetry method （TG-DSC）.The Negative thermal expansion （NTE） properties were detected by in-situ X-ray diffraction.Re- sults showed that flower-like ZrWMoO₈ particles were composed with nanorods aggregates.The obtained prod- uct exhibited positive thermal expansion from room temperature to 120℃.After dehydration at 120℃,it showed NTE property with the thermal expansion coefficient of—4.02×10^-6K^-1in the temperature range from 120℃to 700℃.更多还原