HEAT-SHIELDING COATING MATERIAL

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Disclosed is a heat-shielding coating material having a lower thermal conductivity than that of rare-earth-stabilized zirconia. Specifically disclosed is a heat-shielding coating material mainly composed of a compound represented by compositional formula (1) : Ln1-xTaxO1.5+x [wherein x fulfils the following formula : 0.13≤x≤0.24; and Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements]. Also specifically disclosed is a heat-shielding coating material mainly composed of a compound represented by compositional formula (2) : Ln1-xNbxO1.5+x [wherein x fulfils the following formula : 0.13≤x≤0.24; and Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements]. Further specifically disclosed is a heat-shielding coating material mainly composed of a cubic compound having a fluorite structure and represented by compositional formula (3) : Ln3NbO7 [wherein Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements].