Patent ID: 7601661

Claim:
A calcined indium oxide-tin oxide powder comprising an In—Sn oxide as a predominant component, characterized in that the oxide powder contains no compound oxide (In 4 Sn 3 O 12 ) detectable through X-ray diffraction and has a SnO 2 solid solution amount in In 2 O 3 of 2.3 mass % or more, the SnO 2 solid solution amount being calculated from the ratio between integral diffraction intensity attributed to In 2 O 3 (222) and integral diffraction intensity attributed to SnO 2 (110), and the ratio between In 2 O 3 content and SnO 2 content obtained from an In element concentration and a Sn element concentration through ICP analysis, wherein the calcined indium oxide-tin oxide powder has a specific surface area of from 4 to 15 m 2 /g.