Pb_2MoO_5单晶的坩埚下降法生长  

Growth of Pb_2MoO_5 Single Crystal by Bridgman Method

作　　者：葛从辛[1] 陈红兵[1] 许伟[1] 

机构地区：[1]宁波市新型功能材料及其制备科学国家重点实验室培育基地宁波大学固体材料化学研究所,浙江宁波315211

出　　处：《材料科学与工程学报》2006年第6期883-886,共4页Journal of Materials Science and Engineering

基　　金：宁波市博士科学基金资助项目(2005A610021);浙江省科技攻关基金资助项目(2005C31029);浙江省高校中青年学科带头人;浙江省"151人才工程"培养计划补充项目资助

摘　　要：本文报道了Pb2MoO5单晶的坩埚下降法生长工艺。按照精确的化学计量比进行配料，应用高温固相反应合成Pb2MoO5多晶料；在晶体生长过程中，控制炉体温度于1050～1070℃，调节固液界面温度梯度为30～40℃／cm，按照0．6～1．0mm／h的下降速率，通过改进的坩埚下降法生长出透明完整的Pb2M005单晶；应用X射线衍射、差热分析、透射光谱等方法进行了单晶基本性质的表征。X射线衍射分析证实该晶体为单斜晶系，DTMTC,曲线表明该晶体在958℃一致熔融，高于此温度熔体组分出现严重挥发，该晶体在可见光波长范围具有良好的光学透过性，其吸收边位于370nm波长附近。The growth of Pb2MoO5 crystal by the vertical Bridgman method is reported in this paper. According to the accurate stoiehiometrie composition, the feed material was synthesized by solid-state reaction. In the Bridgman growth, the furnace temperature was controlled at 1050 - 1070℃ and the temperature gradient near solid-liquid interface was adjusted at 30 - 40℃/cm. Using the crucible lowering rate in the range of 0.6- 1.0 mm/h, transparent large size crystal has been grown successfully by the modified Bddgman process. The crystal was characterized by XRD, DTA/TG and spectral measurement. With X-ray single crystal diffraction, the crystal was verified to be crystallized in monoelinie system with space group of C2/m. The DTA/TG curves show that the crystal is melted congruently at 958℃ and the composition in the melt volatilizes seriously above the temperature. The crystal has a high optical transmission in the visible wavelength range, in which the absorption edge is around 370 nm.

关 键 词：声光晶体 Pb2MoO5 晶体生长 坩埚下降法 

分 类 号：O782[理学—晶体学]