氧气压对光学浮区法自旋梯子化合物Sr_(14-x)Ca_xCu_(24)O_(41)单晶制备和组分的影响(英文)  

Single Crystals Sr_(14-x)Ca_xCu_(24)O_(41) Grown under Different Oxygen Pressures by Optical Floating-Zone Technique

作　　者：王清波[1] 周翠[2] 陶前[3] 许祝安[3] 

机构地区：[1]中国地质大学(武汉),湖北武汉430074 [2]空军雷达学院,湖北武汉430019 [3]浙江大学,浙江杭州310027

出　　处：《稀有金属材料与工程》2011年第11期1897-1900,共4页Rare Metal Materials and Engineering

基　　金：Special Foundation for Basic Scientific Research of Central Colleges,China University of Geosciences(Wuhan)(CUGL110236);National Natural Science Foundation of China(41104054,61008054)

摘　　要：利用光学浮区法制备了自旋梯子化合物Sr14-xCaxCu24O41(SCCO)系列单晶样品,研究了氧气压对晶体生长的影响和制备条件对晶体性质的影响程度。发现在常压氧气氛下可以制备出Ca含量x小于8的大块高质量的SCCO晶体,但更高Ca含量的样品仍然必须在高压氧气氛下(0.9MPa)下进行。采用XRD,EDX能谱和电阻率测量实验手段对不同条件制备的SCCO单晶样品进行的分析测试表明,不同氧气压制备出的SCCO单晶样品的性质差别较小,但是高压氧气氛更有利于高Ca含量样品的晶体生长。Spin ladder compounds Sr14-xCaxCu24O41 （SCCO） single crystals have been grown under different oxygen pressures by an optical floating-zone technique. The effects of oxygen pressure on the crystal growth and properties of SCCO were studied. The SCCO single crystals with x≤8 can be grown in a flowing oxygen atmosphere. But the growth of the SCCO compounds with higher Ca content （x8） needs higher pressure （0.9 MPa）. The single crystals were characterized by means of XRD, EDX and resistivity measurement. High pressure is in favor of forming of higher Ca-doped SCCO single crystals. SCCO single crystals grown under different oxygen pressures have almost the same quality.

关 键 词：晶体生长 光学浮区法 氧气压 自旋梯子化合物 

分 类 号：O782.6[理学—晶体学]