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LuTaO4是最高密度的闪烁体基质,研究它的结构及其相变对单晶制备具有指导意义.用固相法制备了Lu2O3和Ta2O5摩尔比为1:1时在不同温度下形成的多晶粉末,用X射线衍射及Rietveld全谱拟合研究了多晶粉末的物相和结构.结果表明,Lu2O3:Ta2O5摩尔比为1:1的样品在1740℃时合成的物相为M′-LuTaO4,在1800℃时为M′-Lu Ta O?4和M-LuTaO4的混合物,在1840C时全部转变为M-LuTaO4.当温度升高到2058℃时,样品呈熔融状态,对淬火得到的样品进行结构精修,给出了M-LuTaO4,Lu3Ta O7和Ta2O5的晶胞和原子坐标参数,它们的重量比分别占78.1%,18.9%和3.0%.这些结果为制备以LuTaO4为基质的高密度闪烁体单晶具有参考价值.
LuTaO4 is the highest density scintillator matrix, and its structure and phase transition are studied to guide the preparation of single crystal.The polycrystalline powders with different molar ratios of Lu2O3 to Ta2O5 (1: 1) were prepared by solid state reaction , The phase and structure of the polycrystalline powder were studied by X-ray diffraction and Rietveld full spectrum fitting.The results show that the phase synthesized at 1740 ℃ is M’-LuTaO4 with a molar ratio of 1: 1 of Lu2O3: Ta2O5, At 1800 ° C, a mixture of M’-Lu Ta O? 4 and M-LuTaO4 was all converted to M-LuTaO4 at 1840 C. The sample was molten as the temperature increased to 2058 ° C, and the resulting sample was quenched Structure refinement, the unit cell and atomic coordinate parameters of M-LuTaO4, Lu3TaO7 and Ta2O5 are given, and their weight ratios are 78.1%, 18.9% and 3.0%, respectively.These results are for the preparation of LuTaO4-based high-density scintillation Crystal single body has a reference value.