Synthesis and structure of transparent zinc-niobate-tellurite glasses with low hydroxyl content

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• 作者：Masato Shimoda^a ; Masayuki Uchida^a ; Tomokatsu Hayakawa^a ; ^{hayatomo@nitech.ac.jp} ; Philippe Thomas^b
• 关键词：Tellurite glasses ; Niobium ; Zinc ; Hydroxyl groups ; Transparency ; Raman ; Immiscible liquids
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：2962-2968
• 全文大小：1526 K
• 卷排序：43

文摘

Low-hydroxyl (OH)-content, transparent zinc-niobate-tellurite glasses (TeO2-Nb2O5-ZnO and TeO2-Nb2O5-ZnCl2) were synthesized by using dry-air atmospheres, stirring of the melt, and preheat treatment before melt preparation. A low OH level (79.8±±6.3 ppm) was achieved by performing a preheat treatment of mixed raw chemicals with zinc chloride and then melting in both open- and dry-air atmospheres with several counts of intermittent stirring. However, this sequence of processes resulted mainly in non-crystallized, opaque products. The basis of this opacity was investigated by performing Raman spectroscopy, X-ray diffraction (XRD), and X-ray fluorescence (XRF) measurements on both the opaque and transparent glasses. Raman spectroscopy revealed that the proportion of Te–O–Te bonds, relative to tellurite unit structures (TeO4, TeO3+1, and TeO3), in the opaque glasses decreased with increasing isolated structures of TeO32−. This decrease resulted possibly from atomic-scaled inhomogeneity and immiscible domain formation in the melts and corresponding glasses, which have less amounts of residual OH groups.