TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: Melt is preferably obtained by melting a mixture containing 10-50 mol% of boron oxide, 5-40 mol% of indium and tin oxides, 10-60 mol% of oxides of magnesium, calcium, strontium, barium, radium, lithium, sodium, potassium and cesium, and 10-60 mol% of groups (RF and R'1/2F, where R and R' are same as defined above). Melt is produced in non-oxidizing atmosphere at 1200degreesC or more. Melt is quickly cooled, and flake-shaped or fiber-shaped amorphous substance is produced. The fluorine-doped ITO crystal is precipitated from amorphous substance at 550-850degreesC, and obtained ITO crystal is separated using acid or water.Preferred Properties: The atomic ratio of tin and sum of indium and tin contained in fluorine-doped ITO microparticle is 0.01-0.15. The fluorine-doped ITO microparticle has average particle diameter of 5-1000 nm, and contains fluorine (0.1-10 mass%). The fluorine-doped ITO crystal has shape of plate or needle, and aspect ratio of 2 or more.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: Melt is preferably obtained by melting a mixture containing 10-50 mol% of boron oxide, 5-40 mol% of indium and tin oxides, 10-60 mol% of oxides of magnesium, calcium, strontium, barium, radium, lithium, sodium, potassium and cesium, and 10-60 mol% of groups (RF and R'1/2F, where R and R' are same as defined above). Melt is produced in non-oxidizing atmosphere at 1200degreesC or more. Melt is quickly cooled, and flake-shaped or fiber-shaped amorphous substance is produced. The fluorine-doped ITO crystal is precipitated from amorphous substance at 550-850degreesC, and obtained ITO crystal is separated using acid or water.Preferred Properties: The atomic ratio of tin and sum of indium and tin contained in fluorine-doped ITO microparticle is 0.01-0.15. The fluorine-doped ITO microparticle has average particle diameter of 5-1000 nm, and contains fluorine (0.1-10 mass%). The fluorine-doped ITO crystal has shape of plate or needle, and aspect ratio of 2 or more. EXAMPLE - Indium oxide (in mol%) (18.5), tin oxide (1.5), barium fluoride (20), barium carbonate (20) and boron oxide (40) were mixed, and reduced amount of ethanol was added. The mixture was uniformly mixed, ground and dried to obtain precursor powder. The obtained powder was loaded into crucible equipped with a nozzle. Molybdenum disilicide was heated for 0.5 hours, and melted at 1500degreesC in electric furnace. The melt was dripped, and bottom portion of nozzle was heated. The droplet was quickly cooled, and flakes-like solid substance was obtained. The flakes were heated at 800degreesC for 8 hours, and fluorine-doped indium tin oxide crystal was precipitated. The flakes were poured into acetic acid solution at 70degreesC for 20 hours, and soluble substance was leached and centrifuged. The supernatant liquid was separated, water-washed, dispersed and dried to obtain fluorine-doped indium tin oxide microparticle having particle size of 30-50 nm. The obtained microparticle was crystalline, and had aspect ratio of 2.5.