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.

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。