Preparation of spherical particles with quartz single crystal

Spherical particles with α-quartz single crystal were obtained from amorphous silica by heating in the atmospheric pressure. The silica particles containing a small amount of titanium oxide and calcium oxide were preparedfrom metal alkoxides and then were heated at 1000°C in the atmospheric pressure. The resulting particle was determined to be a single crystal by means of a transmission electron microscopy and electron diffractometry.