Growth of large (1 mm) MgSiO3 perovskite single crystals: A thermal gradient method at ultrahigh pressure

摘要: Large single crystals of MgSiO 3 perovskite were successfully synthesized by a thermal gradient method at 24 GPa and 1500 °C. This was achieved an improvement high-pressure synthesis technique that allowed us to grow under such ultrahigh-pressure conditions in relatively large volumes (e.g., 10 mm ). Since crystal growth is hindered neighboring crystals, the nucleation density suppressed reducing 20 °C/mm, permitting increase free space for growth. KHCO -Mg(OH) 2 solvent can be used crystals. However, carbonate produces melt inclusions. Silicate sources with composition produce stishovite inclusions, which turn cause splitting The formation these inclusions avoided using H O as 85MgSiO -15Mg SiO 4 silicate source. also allows homogeneous growth, probably because its low viscosity high solubility. High-quality larger than 1 through technical developments.