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为了研究钙钛矿结构的SrTiO_3固化Y~(3+)(~(90)Y的模拟物)的化学稳定性,以Sr(NO_3)_2,TiO_2及Y_2O_3粉体作为原料,按照化学计量比Sr_(1-1.5x)Y_xTiO_3(0≤x≤0.12)设计配方,采用高温固相法制备一系列固化体.利用X射线衍射、扫描电镜和Raman对制备固化体的物相、结构和微观形貌进行分析表征,并对其抗浸出性能进行了研究.结果表明:当x<0.08时,固化体为单一物相,当x≥0.08时,固化体中出现部分烧绿石相;固化体中的Sr~(2+),Y~(3+)的浸出浓度随浸泡时间延长而增大,在浸泡42d时,Sr~(2+)的最大浸出浓度为0.004μg·mL~(-1),Y~(3+)的最大浸出浓度为0.02μg·mL~(-1).
In order to study the chemical stability of SrTiO_3 solidified Y ~ (3 +) (~ (90) Y mimicry) perovskite structure, Sr (NO_3) _2, TiO_2 and Y_2O_3 powders were used as raw materials, (1-1.5x) Y_xTiO_3 (0≤x≤0.12), a series of solidified bodies were prepared by solid state reaction at high temperature.The phase, structure and microstructure of the solidified bodies were characterized by X-ray diffraction, scanning electron microscopy and Raman spectroscopy The results show that when x <0.08, the solidified body is a single phase, and some pyrochlore phase appears in the solidified body when x≥0.08 The leaching concentration of Sr ~ (2 +) and Y ~ (3 +) increased with the soaking time, and the maximum leaching concentration of Sr ~ (2+) was 0.004μg · mL ~ (-1) The maximum leaching concentration of Y ~ (3 +) was 0.02 μg · mL ~ (-1).