新铌酸盐Ba_3Ni_(0.33)Nb_(4.67)O_(15)的合成与X射线衍射分析

Synthesis and X-ray Diffraction Analysis of a New Niobate Ba_3Ni_(0.33)Nb_(4.67)O_(15)

在BaO -Ni2O3 -Nb2O5 三元系统中 ,用固相反应法合成了新铌酸盐Ba3Ni0.33Nb4.67O15。以BaCl2 和B2O3为主要助熔剂制备了Ba3Ni0.33Nb4.67O15 的单晶体。利用四圆单晶衍射仪测定晶胞参数 ,然后采用X射线粉晶衍射法进行了物相分析,对该化合物的粉晶衍射数据进行了指标化 ,并报道了其X射线衍射数据。分析结果表明 ,该化合物属于填满型四方钨青铜结构 ,空间群P4bm(100),晶胞参数为 :a=1.26092(5)nm ,c=0.40096(4)nm ,α=β=γ=90°,Z=2。

A new niobate Ba3Ni0.33Nb4.67O15 was found and synthesized by solid state reaction in the ternary system of BaO-Ni2O3-Nb2O5, and its single crystal was prepared using BaCl2 and B2O3 as main fluxes. The unit cell parameters of Ba3Ni0.33Nb4.67O15 were determined by X _ ray four _ circle single crystal diffraction, and its X _ ray powder diffraction data were indexed and reported in this paper. The results show that Ba3Ni0.33Nb4.67O15 belongs to filled tetragonal tungsten bronze structure with space group P4bm, and unit cell parameters a=1.260 92(5)nm, c=0.400 96(4)nm, α=β=γ=90 °, Z=2.