Patent ID: 8198199

Claim:
A manufacturing method of an epitaxial film, comprising: forming the epitaxial film on an SiO 2 layer with a film thickness of 1.0 nm or more to 10 nm or less provided on a surface of a heated Si substrate by use of a metal target represented by the following composition formula: yA(1−y)B (1), in which A is one or more elements selected from the group consisting of rare earth elements including Y and Sc, B is Zr, and y is a numeric value of 0.03 or more to 0.20 or less in only an inert gas; and successively forming the epitaxial film by use of the metal target in an oxygen-containing gas, wherein the epitaxial film is represented by the following composition formula: xA 2 O 3 −(1−x)BO 2 (2), in which A and B are respectively same elements as A and B of the composition formula (1), and x is a numeric value of 0.010 or more to 0.035 or less.