Preparation and characterization of SO₃-doped barium borosilicate glass-ceramics containing zirconolite and barite phases

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• 作者：Xin Wang^a ; Lang Wu^a ; ^{lang.wu@163.com" class="auth_mail" title="E-mail the corresponding author} ; Huidong Li^b ; Jizong Xiao^a ; Xin Cai^a ; Yuancheng Teng^a
• 关键词：Glass-ceramics ; Barium borosilicate ; Zirconolite ; Barite ; SO3 ; Crystalline phase
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：534-539
• 全文大小：1881 K

文摘

In order to improve the solubility of actinides and sulfate in the glass matrix, barium borosilicate glass-ceramics containing zirconolite and barite crystalline phases were developed. The effects of SO₃ addition (0–8 wt%) on crystalline phases, microstructure, and chemical durability of glass-ceramics belonging to SiO₂-B₂O₃-Na₂O-BaO-CaO-TiO₂-ZrO₂-Nd₂O₃-SO₃ system were mainly studied. The results show that glass transformation temperature decreases slightly with increasing SO₃ content. The main crystalline phase is zirconolite for all of the samples. When the addition SO₃ content is higher or equal to 4 wt%, rice-shaped barite crystals appear in the bulk of glass-ceramics. Barite phase was formed during the melting stage. X-ray fluorescence analysis indicates that about 1.3 wt% of SO₃ can be incorporated in the glass-ceramics when the addition content of SO₃ is 6 wt%. S element mainly distributes in the barite crystals. The decomposition of sulfate mainly occurs during the melting process. Moreover, the addition of a certain content (≤6 wt%) of sulfate has no significant influence on the chemical durability of barium borosilicate glass-ceramics.