Pressure Dependence of Laser-Induced Fluorescence of Sm 3+ in Al 2 O 3 —Y 2 O 3 System Compounds

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 μm intervals, under a microscope.