Synthesis of pyrochlore-borosilicate glass-ceramics for immobilization of high-level nuclear waste. Issue 5 (1st April 2020)

• Record Type: Journal Article
• Authors: Wu, Kangming; Wang, Fu; Liao, Qilong; Zhu, Hanzhen; Liu, Dongsheng; Zhu, Yongchang
• Is Part Of: Ceramics international. Volume 46:Issue 5(2020)
• Page Start: 6085
• Page End: 6094
• Publication Date: 2020-04-01
• Subjects: Borosilicate glass-ceramic -- Pyrochlore -- Synthesis -- Normalized leaching rate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.071
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, borosilicate based glass-ceramics with pyrochlore as crystalline phase for immobilization of high-level nuclear wastes (HLWs) were successfully synthesized by a one-step heat-treatment method. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS) demonstrate that the obtained glass-ceramics show a regularly and uniformly distributed single pyrochlore (Ca, Na)(Nb, Ti)2 Nd0.67 O6 F crystalline phase. Moreover, the glass-ceramics prepared show LR Na, LR B, LR Al, LR Si, LR Nd, LR Ti and LR Nb of about 6.8 × 10 −3, 3.7 × 10 −4, 1.5 × 10 −2, 2.2 × 10 −3, 3.0 × 10 −5, 5.1 × 10 −5 and 5.5 × 10 −6 g m −2 d −1 respectively after 28 leaching days, which are comparable to stable glass-ceramics for HLW immobilization. The results of this study are expected to provide an experimental reference for the engineering synthesis of glass-ceramics for the immobilization of certain HLWs.