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A particle mixture includes particle A below and particle B below different from particle A. [Particle A] A rare earth phosphate particle represented by the formula LnPO4 (where Ln is a rare earth element and represents at least one species of element selected from the group consisting of Sc, Y, La, Eu, Gd, Dy, Yb, and Lu). [Particle B] A rare earth phosphate particle or rare earth titanate particle represented by the formula LnPO4 (where Ln is a rare earth element and represents at least one species of element selected from the group consisting of Sc, Y, La, Eu, Gd, Dy, Yb, and Lu).