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=O.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Na3La9O3(BO3)8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 P-62m (No. 189) with a unit cell of dimensions a = b = 0.89229 (13) nm, c = 0.87366 (17) nm, α = β = 90°, γ = 120°, V = 0.60240 ( 17 ) nm3, and one formula unit per cell. The structure is composed of La( 1 ) O9, La(2) O8,Na( 1 ) O6 poly hedra and three types of crystallographic independent isolated BO3 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.
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