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利用电子衍射、X射线衍射和荧光光谱等方法研究了 L n Ba B9O16(L n=L a,Y)的结构特性 .L n Ba B9O16为单斜晶系 ,其中 L a Ba B9O16的晶胞参数 a=1.36 6 0 nm,b=0 .7882 nm,c=1.6 2 53nm,β=10 6 .15°;YBa B9O16的晶胞参数 a=1.3476 nm,b=0 .7776 nm,c=1.6 0 4 0 nm,β=10 6 .38°.荧光光谱研究表明 ,这两种化合物结构不同 ,Y3 +在 YBa B9O16结构中处于中心对称格位 ,而 L a Ba B9O16中 L a3 +的格位则无中心对称性 .Gd3 +部分取代 L a Ba B9O16∶ Eu3 +中的 L a3 +可改善 Eu3 +离子的发光性质 .L a Ba B9O16∶ Eu3 +在真空紫外区的吸收比较弱 ,这可能与硼氧比较小有关 .
The structural properties of L n Ba B9O16 (L n = L a, Y) have been investigated by means of electron diffraction, X-ray diffraction and fluorescence spectroscopy. L n Ba B9 O16 is monoclinic, a = 1.36 6 0 nm, b = 0.7882 nm, c = 1.6 2 53 nm, β = 10 6 .15 °. The unit cell parameters of YBa B9O16 a = 1.3476 nm, b = 0.7776 nm, c = 1.6 0 4 0 nm, β = 10 6 .38 °. Fluorescence spectra showed that the structures of these two compounds were different. Y3 + was symmetrical in the YBa B9O16 structure, while the lattice position of L a3 + in L a Ba B9O16 There is no central symmetry.The partial substitution of Gd3 + for L a3 + in L a Ba B9O16: Eu3 + can improve the luminescent properties of Eu3 + ions.The absorption of L a Ba B9O16: Eu3 + in the vacuum ultraviolet region is weak, Oxygen is relatively small.