CAJ | 학술논문

以La2Zr2O7 为固化基材,Nd为锕系核素模拟核素,通过溶胶凝胶法制备了 (La1-yNdy)2Zr2O7(0≤y≤1.0)系列烧绿石模拟固化体. 样品经过高能γ辐照,辐照剂量为233.78 kGy. 通过PCT粉末浸出测试方法对固化体化学稳定性进行了测试,辐照前后样品的La,Nd,Zr均保持了较低的化学浸出率10 -4 ( g· m-2· d-1 ) ,锆基烧绿石具有可靠的化学稳定性主要取决于稳定的Zr-O键. 当模拟锕系核素Nd的掺杂量达到相变区域(0.6≤y≤0.8)时,元素浸出率有明显增加,主要可能是结构的无序化导致. γ辐照后样品Zr的浸出率在相变区域也出现明显的增加,可能是由于γ辐照导致固化体Zr-O48f键结构的变化.
이La2Zr2O7 위고화기재,Nd위아계핵소모의핵소,통과용효응효법제비료 (La1-yNdy)2Zr2O7(0≤y≤1.0)계렬소록석모의고화체. 양품경과고능γ복조,복조제량위233.78 kGy. 통과PCT분말침출측시방법대고화체화학은정성진행료측시,복조전후양품적La,Nd,Zr균보지료교저적화학침출솔10 -4 ( g· m-2· d-1 ) ,고기소록석구유가고적화학은정성주요취결우은정적Zr-O건. 당모의아계핵소Nd적참잡량체도상변구역(0.6≤y≤0.8)시,원소침출솔유명현증가,주요가능시결구적무서화도치. γ복조후양품Zr적침출솔재상변구역야출현명현적증가,가능시유우γ복조도치고화체Zr-O48f건결구적변화.
La2 Zr2 O7 pyrochlore doped with Nd have been synthesized by sol -spray pyrolysis method , Nd is used as surrogated element for actinides .(La1-yNdy)2Zr2O7(0≤y≤1.0) samples have been irradia-ted by 60 Co γ-ray source with 233.78 kGy dose.Leaching studies of unirradiation and irradiation pyro-chlore samples were performed through the PCT method in deionized water .The leaching rate of La ,Nd, Zr in these samples are extremely low about 10 -4 ( g · m-2 · d-1 ) , which suggests that zircontae pyro-chlore is chemical stable in contact with water .The leaching rate appears to increase significantly as Nd content increase from 0.6 to 0.8, which results from the structure disorder of (La1-yNdy)2Zr2O7 pyro-chore .The leaching rate of Zr in irradiation samples also increase with increasing Nd content , it is maybe that the Zr-O48f bond is changed under the γ-irradiation condition.