负膨胀材料ZrW_2O_8的新制备方法及拉曼光谱研究  

New Preparation Method and Raman Spectroscopic Study of ZrW_2O_8 Ceramics

作　　者：郭向阳[1] 牛强[1] 程春晓[1] 

机构地区：[1]洛阳理工学院数理部,河南洛阳471023

出　　处：《信阳师范学院学报（自然科学版）》2013年第2期279-282,共4页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：河南省教育厅科技计划项目(12B140010);洛阳理工学院自然科学项目(2011YZ07)

摘　　要：以ZrOCl2.8H2O、WO3和浓氨水为原料,采用化学沉淀法制备ZrW2O8陶瓷,通过XRD、拉曼光谱和热膨胀仪等分析手段对产物结构进行表征.结果表明,采用化学沉淀法在温度1473 K～1523 K,时间50～240 min内可以制备出具有较高纯度的ZrW2O8.变温拉曼光谱进一步表明,ZrW2O8的负热膨胀与低波数的声子模有关,另外高频光学声子模对其负热膨胀也有贡献.ZrW2O8 ceramics was synthesized by using ZrOCl2 ·8H2 O, WO3 and NH3· H2 O as reactants via a co- precipitation synthesis method. The prepared ZrW2 0s ceramics was characterized by X-ray diffraction, Raman spectro- scopic and dilatometer analyses . The effects of sintering temperature and time were investigated and the optimum re- suits are 1473 K - 1523 K and 50 - 240 min respectively. Raman spectroscopic study shows that the low phonon modes contribute greatly to the negative thermal expansion of cubic ZrW2O8 and some of the high-frequency stretching modes, particularly the asymmetric stretching modes contribute also to the negative thermal expansion.

关 键 词：ZRW2O8 负热膨胀 共沉淀法 拉曼光谱 

分 类 号：O469[理学—凝聚态物理]