Abstract

The piezospectroscopic (PS) coefficients relating frequency shift to pressure are evaluated for Sm³⁺ in the Al₂O₃-Y₂O₃ system compounds, which include Al₂O₃, Y₃Al₅O₁₂, YAlO₃, Y₄Al₂O₉, and Y₂O₃. The fluorescence peaks are inherently narrow for all the synthesized compounds, on the basis of the f-f transition nature of Sm³⁺ ion. Furthermore, the PS coefficients are ranged from -2.2 to -8.2 cm^-1/GPa, which are similar to the reported value for the R1 line of ruby and suitable for the PS stress evaluation. PS stress distribution measurements are demonstrated with sintered Y₃Al₅O₁₂ ceramics as a sample, with 50 mu m intervals, under a microscope.

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