助熔剂法生长二钛酸钡单晶  

Growth of barium dititanium single crystals by flux method

作　　者：徐军[1] 张立果[1] 贺晓平[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2012年第6期53-55,共3页Journal of Wuhan Institute of Technology

基　　金：教育部留学回国人员科研启动基金;湖北省教育厅科学研究重点项目(D20101504)

摘　　要：针对二钛酸钡仅在一窄小的温度区间热力学稳定,其单晶制备比较困难的问题,首次利用助熔剂法生长二钛酸钡单晶.以合成的二钛酸钡粉末为前躯体,以偏硼酸钡为助熔剂,以少量氧化硼为相稳定剂,二钛酸钡和偏硼酸钡的摩尔比为2∶3,二钛酸钡和氧化硼的摩尔比为1∶0.25,泡料温度为1 180℃,降温速率为3.3℃/h.温度降至1 080℃时,终止温度程序,使其自然降至室温.成功地生长出了二钛酸钡单晶,晶体尺寸大约为2.5 mm×0.3 mm×0.3 mm.To overcome the difficulty of growing barium dititanate single crystals due to the narrow temperature range for its thermodynamic stability, we tried and successfully synthesized barium dititanate single crystals by a flux method for the first time. We used barium dititanate powders as precursors, barium metaborate as flux and boron oxide as additives to stabilize the barium dititanate phase. The molar ratio of barium dititanium to barium borate was 2： 3, and the molar ratio of barium dititanium to boric oxide was 1：0.25 ;the soaking temperature was 1 180 ℃; the crystal growth stopped after the temperature decreased slowly to 1 080 ℃ with a 3.3 ℃/h. The crystals of 2.5 mm× 0.3 mm ×0. 3 mm in size were obtained.

关 键 词：二钛酸钡 单晶 助熔剂法 

分 类 号：TM221[一般工业技术—材料科学与工程]