Na_3La_9O_3(BO_3)_8的晶体结构(英文)  

Crystal Structure of Sodium LanthanumOxyborate Na_3La_9O_3(BO_3)_8

作　　者：张国春[1] 傅佩珍[1] 李云阁[1] 吴以成[1] 

机构地区：[1]中国科学院理化技术研究所北京人工晶体研究与发展中心,北京100080

出　　处：《人工晶体学报》2005年第5期765-771,共7页Journal of Synthetic Crystals

基　　金：theNationalScienceFoundationofChina(No.50372073)

摘　　要：以Na2CO3-H3BO3为助熔剂,用顶部籽晶法生长出Na3La9O3(BO3)8单晶。测定了Na3La9O3(BO3)8晶体结构,结果表明:该晶体属六方晶系,空间群:P62m,晶胞参数为a=b=0.89229(13)nm,c=0.87366(17)nm,α=β=90°,γ=120°,Z=1,V=0.60240(17)nm3,密度为5.066g/cm3。晶体结构中的硼氧基团是平面的BO3基团,BO3基团相互独立,通过与Na(1)O6、La(1)O9和La(2)O8的配位多面体连结形成层状结构,所有层平行于(001)面。描述了NaLaO(BO)晶体在非线性光学材料领域的应用前景。A sodium lanthanum oxyborate crystal with the composition Na3La9O3 （BO3）8 in the ternary system Na2O-La2O3-B2O3 has been successfully grown from a high-temperature solution by employing Na2CO3 and H3BO3 as fluxes. The crystal structure has been established by the single crystal X-ray diffraction methods. The compound crystallizes in the hexagonal system, space group P6^-2m （No. 189 ） with a unit cell of dimensions a = b = 0.89229 （ 13 ） nm, c = 0. 87366 （ 17 ） nin, α=β=90°,γ=120°, V = 0. 60240 （ 17 ） nm^3, and one formula unit per cell. The structure is composed of La （ 1 ） 09, La （2） O8, Na（ 1 ）O6 poly hedra and three types of crystallographic independent isolated BOa groups that are linked together to form infinite two-dimensional layers, respectively. These layers are stacked parallel to the （001） plane. Its potential as a nonlinear optical material was also described.

关 键 词：Na3La9O3(BO3)8 晶体结构 倍频效应 

分 类 号：O782[理学—晶体学]