Systematic investigation of the strontium zirconium phosphate ceramic form for nuclear waste immobilization
Systematic investigation of the strontium zirconium phosphate ceramic form for nuclear waste immobilization
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DOI：
10.1016/j.jnucmat.2016.01.016
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发表时间：
2016-04
影响因子：
3.1
通讯作者：
V. Pet’kov;E. Asabina;V. N. Loshkarev;M. Sukhanov
中科院分区：
文献类型：
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作者：
V. Pet’kov;E. Asabina;V. N. Loshkarev;M. Sukhanov
总结了以Sr0.5Zr2（PO 4）3为主体的NaZr 2（PO 4）3型（NZP）结构固载含90 Sr放射性废物的热物理性质和水解稳定性的研究结果。没有任何多晶型转变的温度依赖性的热容量在7和665 K之间是由晶体Sr0.5Zr2（PO 4）3的稳定性。在298-673 K范围内，零孔隙率下的导热系数计算值为1.86-2.40 W·m-1 K-1。由于其平均线性热膨胀系数，该化合物可被分类为低热膨胀材料。在酸性和碱性介质中的水解稳定性研究表明，释放到侵蚀性浸出介质中的Sr 2+离子的相对质量分数不超过样品质量的1%。索氏浸提研究表明，对Sr 2+离子释放到蒸馏水中有很大的抵抗力。NZP材料的烧结性差限制了其实际应用，这也是文献中Sr0.5Zr2（PO 4）3致密陶瓷制备方法的原因。
We have summarized our data and literature ones on the thermophysical properties and hydrolytic stability of Sr0.5Zr2(PO4)3compound as a host NaZr2(PO4)3-type (NZP) structure for immobilization of90Sr-containing radioactive waste. Absence of any polymorphic transformations on the temperature dependence of its heat capacity between 7 and 665 K is caused by the stability of crystalline Sr0.5Zr2(PO4)3. Calculated values of thermal conductivity coefficients at zero porosity in the range 298–673 K were 1.86–2.40 W·m−1K−1. The compound may be classified as low thermal expanding material due to its average linear thermal expansion coefficient. Study of the hydrolytic stability in acid and alkaline media has shown that the relative mass fraction of Sr2+ions, released into aggressive leaching media, didn't exceed 1% of the mass of sample. Soxhlet leaching studies have shown substantial resistance towards the release of Sr2+ions into distilled water. Feeble sinterability constrains practical applications of NZP substances, that is why known in literature methods of Sr0.5Zr2(PO4)3dense ceramics obtaining have been reviewed.