TY - JOUR
T1 - Microstructure and performance studies of (Mo, Ru, Pd, Zr) tetra-doped gadolinium zirconate pyrochlore
AU - Shu, Xiaoyan
AU - Fan, Long
AU - Hou, Chenxi
AU - Duan, Tao
AU - Wu, Yanlin
AU - Chi, Fangting
AU - Ma, Dengsheng
AU - Lu, Xirui
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China: [Grant Number 21507105]; Foundation of Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology: [Grant Number 15yyhk10]; Doctor Foundation in Southwest University of Science and Technology: [Grant Number 10zx7126]; Project of Sichuan Education Department: [Grant Number 15ZB0116].
PY - 2017/7/4
Y1 - 2017/7/4
N2 - Proper disposal of nuclear waste with multi-nuclides and multi-valence is still challenge. A series of (Mo, Ru, Pd, Zr) tetra-doped Gd2Zr2O7 ceramics were studied to understand the microstructure and performance evolution of nuclear waste forms that immobilised simulated waste after trialkyl phosphine oxides (TRPO) process. The structure of as-obtained samples were tested by X-ray diffraction, Raman, scanning electron microscope, electron back-scattered diffraction, and energy-dispersive X-ray spectroscopy, while the mechanical and chemical performance were characterised by Vickers hardness and aqueous leaching method. The results indicate that the mechanical behaviour are closely linked with the phase structure, and the highest Vickers hardness is obtained at the phase turning point. The leaching results show that the normalised leaching rate (LR) of the doped elements decrease in the order of Mo, Ru, Pd, Zr. After reaching equilibrium, their LR are as low as 4.12 × 10−4 g·m−2·d−1, 1.50 × 10−5g·m−2·d−1, 1.30 × 10−5 g·m−2·d−1, and 2.09 × 10−7 g·m−2·d−1, respectively.
AB - Proper disposal of nuclear waste with multi-nuclides and multi-valence is still challenge. A series of (Mo, Ru, Pd, Zr) tetra-doped Gd2Zr2O7 ceramics were studied to understand the microstructure and performance evolution of nuclear waste forms that immobilised simulated waste after trialkyl phosphine oxides (TRPO) process. The structure of as-obtained samples were tested by X-ray diffraction, Raman, scanning electron microscope, electron back-scattered diffraction, and energy-dispersive X-ray spectroscopy, while the mechanical and chemical performance were characterised by Vickers hardness and aqueous leaching method. The results indicate that the mechanical behaviour are closely linked with the phase structure, and the highest Vickers hardness is obtained at the phase turning point. The leaching results show that the normalised leaching rate (LR) of the doped elements decrease in the order of Mo, Ru, Pd, Zr. After reaching equilibrium, their LR are as low as 4.12 × 10−4 g·m−2·d−1, 1.50 × 10−5g·m−2·d−1, 1.30 × 10−5 g·m−2·d−1, and 2.09 × 10−7 g·m−2·d−1, respectively.
KW - Pyrochlore
KW - Raman
KW - TRPO waste
KW - chemical durability
KW - fluorite
KW - hardness
KW - phase transformation
KW - waste forms
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U2 - 10.1080/17436753.2017.1295647
DO - 10.1080/17436753.2017.1295647
M3 - Article
AN - SCOPUS:85014523727
VL - 116
SP - 272
EP - 277
JO - Advances in Applied Ceramics
JF - Advances in Applied Ceramics
SN - 1743-6753
IS - 5
ER -