| abstract |
A coating liquid for forming an oxide, the coating liquid including: A element, which is at least one alkaline earth metal; and B element, which is at least one selected from the group consisting of gallium (Ga), scandium (Sc), yttrium (Y), and lanthanoid, wherein when a total of concentrations of the A element is denoted by C A mg/L and a total of concentrations of the B element is denoted by C B mg/L, a total of concentrations of sodium (Na) and potassium (K) in the coating liquid is (C A +C B )/10 3 mg/L or less and a total of concentrations of chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), and copper (Cu) in the coating liquid is (C A +C B )/10 3 mg/L or less. |