Abstract: Infrared absorbing particles include composite tungsten oxide particles, wherein the composite tungsten oxide particles have a hexagonal crystal structure, and wherein the composite tungsten oxide particles are represented by a general formula MxWyOz (where M is one or more elements selected from Cs, Rb, K, Tl, Ba, Ca, Sr, and Fe, W is tungsten, 0 is oxygen, 0.25?x/y?0.39, and 2.70?z/y?2.90).

Abstract: Provided is a heat ray shielding resin sheet material including: near infrared absorbing material particles; and a resin, wherein the near infrared absorbing material particles contain particles of a complex tungsten oxide represented by General Formula: MxWyOz (where an element M is one or more elements selected from H, He, alkali metals, alkaline-earth metals, 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, 0.001?x/y?1, and 3.0<z/y).

Abstract: Near-infrared absorbing material particles contain composite tungsten oxide particles represented by a general formula MxWyOz, wherein the element M is one or more of elements selected from H, He, an alkali metal, an alkaline earth metal, a rare earth element, 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, wherein the W is tungsten, wherein the O is oxygen, and wherein the x, y, and z satisfy 0.001?x/y?1 and 3.0<z/y.