TiO_2晶体和TiO_2-SiO_2复合变体对铀的吸附及其辐照稳定性

THE SORPTION OF URANIUM ON CRYSTALLINE TiO_2 AND COMPOSITE MODIFICATION TiO_2SiO_2 AND THE IRRADIATION STABILITY OF THE STUDIED MATERIALS

用Ｘ射线粉末衍射分析（ＸＲＤ）及红外光谱（ＩＲ）方法研究了ＴｉＯ２晶体中非晶态ＳｉＯ２的存在导致形成新的变体的过程；同时研究了ＴｉＯ２、ＳｉＯ２水合氧化物及其复合变体的辐照稳定性。结果表明，非晶态ＳｉＯ２的存在有助于由锐钛矿和金红石共同组成的ＴｉＯ２复合晶体转变为单一的锐钛矿。ＴｉＯ２、ＳｉＯ２及其复合变体良好的辐照稳定性为其用于核废料的处理提供了有利的条件。

RD and IR are employed to monitor the modification processes of compound crystalline TiO_2 in the presence of amorphous SiO_2.The radiation stability of TiO_2,SiO_2 and their composite modification are also investigated.Amorphous SiO_2 favor the formation of anatase (101) rather than rutile (110).The good irradiation stability of TiO_2,SiO_2 and their composite modification provides the possibility of these materials in the treatment of radioactive wastes.