铌酸钇成核透明铝硅酸锂微晶玻璃形成过程中的相变

IF 2.7 Q1 MATERIALS SCIENCE, CERAMICS Ceramics-Switzerland Pub Date : 2023-07-06 DOI:10.3390/ceramics6030092
O. Dymshits, A. Bachina, I. Alekseeva, V. Golubkov, M. Tsenter, S. Zapalova, K. Bogdanov, D. Danilovich, A. Zhilin
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引用次数: 0

摘要

研究了掺杂钴离子的钇铌氧化物混合成核铝硅酸盐锂玻璃的相变,以开发多功能透明微晶玻璃。700 ~ 900℃等温热处理得到的初始玻璃和微晶玻璃含有畸变四方结构的YNbO4纳米晶体。在1000°C及以上加热的样品中,观察到单斜的特征。高温x射线衍射技术澄清单斜钇orthoniobate形成的机制,不发生在高温热处理900°C以上但在冷却后的微晶玻璃热处理,当YNbO4纳米晶体与正方结构进行二阶转换~ 550°C。在800 ~ 1000℃范围内制备的微晶玻璃以β-石英结构的铝硅酸锂固溶体(ss)为主。这些结构转变得到了拉曼光谱的证实和扫描电镜的分析。由于Co2+离子主要以八面体配位方式进入该相,取代Li+离子,材料的吸收光谱仅随β-石英ss的结晶而发生变化。在结晶温度为1000℃时,β-石英固溶体中的Co2+配位变为四面体配位。透明微晶玻璃的热膨胀系数约为10 × 10−7 K−1。
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Phase Transformations upon Formation of Transparent Lithium Alumosilicate Glass-Ceramics Nucleated by Yttrium Niobates
Phase transformations in the lithium aluminosilicate glass nucleated by a mixture of yttrium and niobium oxides and doped with cobalt ions were studied for the development of multifunctional transparent glass-ceramics. Initial glass and glass-ceramics obtained by isothermal heat-treatments at 700–900 °C contain YNbO4 nanocrystals with the distorted tetragonal structure. In samples heated at 1000 °C and above, the monoclinic features are observed. High-temperature X-ray diffraction technique clarifies the mechanism of the monoclinic yttrium orthoniobate formation, which occurs not upon high-temperature heat-treatments above 900 °C but at cooling the glass-ceramics after such heat-treatments, when YNbO4 nanocrystals with tetragonal structure undergo the second-order transformation at ~550 °C. Lithium aluminosilicate solid solutions (ss) with β-quartz structure are the main crystalline phase of glass-ceramics prepared in the temperature range of 800–1000 °C. These structural transformations are confirmed by Raman spectroscopy and illustrated by SEM study. The absorption spectrum of the material changes only with crystallization of the β-quartz ss due to entering the Co2+ ions into this phase mainly in octahedral coordination, substituting for Li+ ions. At the crystallization temperature of 1000 °C, the Co2+ coordination in the β-quartz solid solutions changes to tetrahedral one. Transparent glass-ceramics have a thermal expansion coefficient of about 10 × 10−7 K−1.
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来源期刊
CiteScore
3.00
自引率
7.10%
发文量
66
审稿时长
10 weeks
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