Complex tungsten oxide particles, near-infrared ray absorbing particle dispersion liquid, and near-infrared ray absorbing particle dispersion product

Abstract

Complex tungsten oxide particles include complex tungsten oxide represented by a general formula: MxWyOz (where, the M element is at least one element selected from the group consisting of alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; 0.20≤x/y≤0.37; and 2.2≤z/y≤3.3). A crystal system of the complex tungsten oxide is hexagonal. An STEM-HAADF image observation of the complex tungsten oxide particles at incidence includes a spot in a number ratio of 0.01% or greater and 10% or less, where the spot is a spot at which a value of a Z-contrast of tungsten atoms is reduced to be 95% or lower of an average value of the Z-contrast of tungsten atoms.

Dependencies are inferred from the claim text.