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PROBLEM TO BE SOLVED : To provide a thermal barrier coating material having the heat conductivity lower than that of rare earth stabilized zirconia. SOLUTION : The thermal barrier coating material mainly contains a cubic compound having a fluorite structure to be expressed by the composition formula (1) : Ln3NbO7 (where, Ln denotes one or two or more elements selected from a group consisting of Sc, Y and lanthanoids). COPYRIGHT : (C)2009, JPO&INPIT