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Effect of high pressure on the structure of barium disilicate glass-ceramics
Journal of Non-Crystalline Solids ( IF 3.2 ) Pub Date : 2020-08-19 , DOI: 10.1016/j.jnoncrysol.2020.120380
L.L. Evaristo , B.J.A. Moulton , P.S. Pizani , S. Buchner

A systematic study of crystallization of barium disilicate at high pressures and temperatures was undertaken. Two groups of samples were submitted to nucleation at 710°C, and then submitted to a crystal growth at either 860°C or 960°C respectively. Both groups were heat treated at 1 atm, 2.5 GPa, 4 GPa, and 7.7 GPa. The diffraction results show that at atmospheric pressure, the phases formed are, monoclinic Ba6Si10O26, orthorhombic low-Ba2Si4O10, and monoclinic high-Ba2Si4O10 depending on the temperature treatment. In contrast, at 7.7 GPa orthorhombic BaSiO3, monoclinic phase Ba6Si10O26 and coesite formed when treated at 860°C, whereas monoclinic Ba6Si10O26 is predominantly formed when treated at 960°C. At 2.5 and 4 GPa orthorhombic low-Ba2Si4O10 formed when treated at 960°C. The high frequency Raman modes are strongly affected by the different pressure and temperature treatments. The shifts and formations of distinct vibrations modes are discussed as function of pressure.



中文翻译:

高压对二硅酸钡玻璃陶瓷结构的影响

进行了在高压和高温下二硅酸钡结晶的系统研究。两组样品在710°C下进行成核,然后分别在860°C或960°C下进行晶体生长。两组均以1 atm,2.5 GPa,4 GPa和7.7 GPa进行热处理。衍射结果表明,在大气压下,取决于温度处理,形成的相为单斜Ba 6 Si 10 O 26,正交晶低Ba 2 Si 4 O 10和单斜高Ba 2 Si 4 O 10。相反,在斜方晶BaSiO 3为7.7 GPa时,单斜晶相Ba当在860°C下处理时,会形成6 Si 10 O 26和堇青石,而在960°C下处理时,主要形成单斜晶Ba 6 Si 10 O 26。在960°C下处理时,在2.5 GPa和4 GPa下形成正交晶低Ba 2 Si 4 O 10。高频拉曼模式受不同压力和温度处理的强烈影响。讨论了不同振动模式的变化和形成与压力的关系。

更新日期:2020-08-20
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