Patent ID: 7611646

Claim:
An oxide sintered body consisting essentially of gallium, indium, and oxygen, such that: a content of the gallium is more than 65 at. % and less than 100 at. % with respect to all metallic elements; the oxide sintered body having one or more phases selected from a gallium oxide phase having β-Ga 2 O 3 type structure (β-Ga 2 O 3 phase), a gallium indium oxide phase having β-Ga 2 O 3 type structure (β-GaInO 3 phase), or (Ga, In) 2 O 3 phase; the oxide sintered body having an indium oxide phase (In 2 O 3 phase) of bixbyite-type structure; and a density of the sintered body is 5.0 g/cm 3 or more, wherein a film can be formed by a direct current sputtering method when the oxide sintered body is used as a sputtering target, and wherein a ratio in which the indium oxide phase (In 2 O 3 phase) of the bixbyite-type structure contained is 5% or less in terms of an X-ray diffraction peak intensity ratio defined by the following formula (1): In 2 O 3 phase (400)/{β-Ga 2 O 3 phase (−202)+β-GaInO 3 phase (111)+(Ga,In) 2 O 3 phase (2θ≈33°)}×100 [%] (1).