Composite tungsten oxide film and method for producing same, and film-deposited base material and article each provided with said film

A composite tungsten oxide film comprising a composition represented by a general formula MxWyOz, wherein an element M is one or more elements selected from alkaline metal, alkaline earth metal, Fe, In, Tl, and Sn, an element W is tungsten, and an element O is oxygen, as a main component,

• wherein 0.001≤x/y≤1, 2.2≤z/y≤3.0,
• wherein a particle dispersion is not contained substantially in the composition,
• wherein the composite tungsten oxide film contains a hexagonal crystal structure,
• wherein when an intensity ratio between a diffraction intensity I (200) of hexagonal (200) face and a diffraction intensity I (002) of hexagonal (002) face by X-ray diffraction using CuKα ray is I (002)/I (200), the I (002)/I (200) is 0.30 or more and 0.50 or less, and
• wherein a ratio c/a between a-axis and c-axis of hexagonal crystal by X-ray diffraction using CuKα ray is 1.018 to 1.029.