期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 357, 期 -, 页码 424-430出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.06.026
关键词
Gd(2)Zr(2)O(7)pyrochlore; U3O8; Heavy-ion irradiation; Radiation tolerance; Amorphization
资金
- National Natural Science Foundation of China [21507105, 51672228]
- Key Project of Sichuan Education Department [15ZB0116]
- Foundation of Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology [15yyhk10]
In this research, the heavy-ion irradiation effects of U-bearing Gd2Zr2O7 ceramics were explored for nuclear waste immobilization. U3O8 was designed to be incorporated into Gd2Zr2O7 from two different routes in the form of (Gd1-4xU2x)(2)(Zr1-xUx)O-7 (x = 0.1, 0.14). The self-irradiation of actinide nuclides was simulated by Xe20+ heavy-ion radiation under different fluences. Grazing incidence X-ray diffraction (GIXRD) analysis reveals the relationship between radiation dose, damage and depth. The radiation tolerance is promoted with the increment of U3O8 content in the discussed range. Raman spectroscopy testifies the enhancement of radiation tolerance and microscopically existed phase evolution from the chemical bond vibrations. In addition, the microstructure and elemental distribution of the irradiated samples were analyzed as well. The amorphization degree of the sample surface declines as the U content was elevated from x = 0.1 to x = 0.14.
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