【摘要】 本文讨论了稀土-铋复合氧化物的制备及某些性质的变化规律.稀土与三价金属的复合氧化物的制备与性质已做了大量工作,然而关于稀土-铋复合氧化物的热稳定性、磁性和反射光谱及其变化规律文献报道不多. 在1200℃空气中制备的稀土-铋复合氧化物的晶体结构可分为三种类型,其中三价轻稀土（RE=La,Nd,Sm,Eu和Gd）-铋复合氧化物为菱形结构的固溶体,属于三方晶系,Pr₆O₁₁（Bi₂O₃）_1.8和（Tb₄O₇）_1.5·（Bi₂O₃）_1.68为萤石型结构的固溶体,属立方晶系.其余的3RE₂O₃·nBi₂O₃（RE=Ce,Dy,Ho,Er,Tm,Yb,Lu和Y,n分别为0.80,1.68,1.60,1.30,0.94,0.82,0.12和1.34）复合氧化物为萤石型的固溶体和C-型RE₂O₃的混相.这些固溶体的晶胞参数随着原子序数的增加而减少,这种变化规律是由镧系收缩引起的. 随着稀土原子序的增加,稀土-铋复合氧化物的热稳定性降低,并在钆处出现转折,它们磁化率呈现具有两个极大值的周期变化.由于Bi-O键的存在,在它们的反射光谱中有一个宽的紫外吸收带,因此它们可能应用为着色透镜玻璃和紫外吸收材料.更多还原

【Abstract】 In this paper we present some informations about the structures, thermogravimetric losses, magnetic susceptibilities and reflective spectra of rare earth-bismuth complex oxide.The crystal structures for RE-Bi complex oxide system may be classified into three types: （1） the fluorite single phase （belong to cubic system） for Pr-Bi and Tb-Bi oxide solid solutions; （2） La-type （light rare earth） rhombohedral single phase for La-Bi, Nd-Bi, Sm-Bi, Eu-Bi and Gd-Bi oxide solid solutions; （3） the mixed phases of fluorite type （F） for Ce-Bi, Dy-Bi, Ho-Bi, Er-Bi, Tm-Bi, Yb-Bi, Lu-Bi and Y-Bi oxide solid solutions with corresponding C-type RE₂O₃. The lattice paremeters decrease with the increase of RE atomic numbers. This change is caused by the lanthanide contraction.With the increase of RE atomic numbers the thermal stabilities of RE-Bi oxide solid solutions decrease and Gd break occurs, the magnetic susceptibilities show a periodic change with two maxima at Nd and Ho. Moreover, the UV absorption band in the reflective spectra shifts to longer wavelength by the presence of Bi-O component, hence it might be used as the starting materials of colour lens glass for UV-absorption.更多还原