THERMAL BARRIER COATING MATERIAL

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A thermal barrier coating material having a lower thermal conductivity than rare earth stabilized zirconia materials. A thermal barrier coating material comprising mainly a compound represented by composition formula (1) : [in-line-formulae]Ln1-xTaxO1.5+x [/in-line-formulae] wherein 0.13≦x≦0.24, and Ln represents one or more elements selected from the group consisting of Sc, Y and the lanthanoid elements. Also, a thermal barrier coating material comprising mainly a compound represented by composition formula (2) : [in-line-formulae]Ln1-xNbxO1.5+x [/in-line-formulae] wherein 0.13≦x≦0.24, and Ln represents one or more elements selected from the group consisting of Sc, Y and the lanthanoid elements. Also, a thermal barrier coating material comprising mainly a cubic compound having a fluorite structure represented by composition formula (3) : [in-line-formulae]Ln3NbO7 [/in-line-formulae] wherein Ln represents one or more elements selected from the group consisting of Sc, Y and the lanthanoid elements.