PRODUCTION OF SN-DOPED IN2O3 POWDER HAVING LOW ELECTRICAL RESISTANCE

摘要

PURPOSE:To prepare SnO2-doped In2O3 powder having low electrical resistance, by adjusting the pH of an aqueous solution containing an indium salt and stannous chloride at a specific ratio with oxalic acid and ammonia, and sintering the resultant precipitate under a specific condition. CONSTITUTION:Oxalic acid is added to an aqueous solution containing a water- soluble indium salt such as chloride, sulfate, etc. and stannous chloride at a ratio to obtain a product having an Sn-content of 0.1-20%. After the reaction, ammonia is added to the reaction mixture to adjust the pH to 0-2. The obtained precipitate is separated by filtration, washed thoroughly, dried, and sintered at 400-800 deg.C in an oxidizing atmosphere such as air. An electrically conductive SnO2-doped In2O3 fine powder having an electrical resistance of as low as about =100OMEGA.cm can be prepared by this method.