榍石固溶体的稳定性

The Stability of Solid Solution of Sphene

以H2SiO3、CaCO3、TiO2、Nd2O3和Al2O3为原料,通过固相法合成的榍石固溶体,对合成榍石固溶体进行PCT粉末浸泡实验和60Co源辐照试验,借助X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)、原子吸收光谱(AAS)、荧光光谱(FS)、激光拉曼光谱(LRS)分析等手段,研究榍石固溶体的化学稳定性和抗γ射线辐照的稳定性。结果表明,在pH值为5～9的水溶液中掺钕榍石固溶体具有良好的化学稳定性;辐照累计剂量为5.76×105Gy的60Co源辐照没有造成榍石固溶体晶格的的辐射损伤,榍石固溶体具有良好的抗γ射线辐照稳定性;在90℃、pH值为7的浸泡条件下,榍石固溶体的Ca2+、Ti4+和Nd3+的42d归一化浸出率分别为6.32×10-3、3.9×10-5、5.38×10-3g/(m2·d)。

The anti-radiation stability and chemical stability of solid solution of sphene that was synthesized using CaCO3, TiO2, H2SiO3, Nd2O3and Al2O3as raw materials through solid-state reaction were studied by the leaching and irradiation experiments and by the means of XRD, SEM, EDS, AAS, FS, LRS and IR analysis. The results indicated that the sphene synroc has a good anti-radiation stability and chemical stability. When the cumulative radiation dose of ^60Co was 5.76 × 105Gy, it did not result in the lattice of radiation damage. When the pH was 7 at 90 ℃, the nominalized leach rate of Ca^2＋, Ti^4＋ and Nd^3＋ （42 d） were 6.32 × 10-3, 3.9 × 10^-5 and 5.38 ×10^-3 g/（m^2 . d） separately.