球状リューサイト結晶の大きさ制御

抄録

Spherical leucite crystals with 100μm in diameter were obtained when a starting sample consisting of K₂SO₄:Al₂(SO₄)₃:SiO₂(amorphous silica, 10μm)=5.9:1.0:1.1 (molar ratio) was heated at 1000°C for 3h and then treated with hot HCI. The effect of SiO₂ polymorphs and their starting particle size on the size of the resulting spherical leucite crystals was investigated. In addition, the effect of preheating and grinding the starting sample on the size of leucite crystals was studied. The size of the spherical leucite crystals decreased with decreasing the size of SiO₂ particles. When quartz particles with 3.2 to 52.8μm in diameter were used, the diameter of the spherical leucite crystals was in the range 19.0 to 55.2μm. When tridymite particles with diameter 3.0 to 72.0μm were used, the size of spherical leucite crystals was between 12.4 and 135.8μm. When the starting sample with amorphous SiO₂ was preheated to 800°C, cooled to room temperature rapidly, and ground to 4.5μm, the size of spherical leucite crystals reached on average size of 2.6μm.