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The R fluorescence lines of rubies that contain 0.022, 0.068, 0.211, 0.279, 0.556, 1.221, and 1.676 wt% of Cr 2 O 3  were measured at temperatures of 100-600 K and at atmospheric pressure. The R 1  line wavenumbers of all of the ruby samples shifted linearly as the temperature increased from 298 to 600 K at atmospheric pressure, and the temperature dependence increased from -0.157 ± 0.001 cm -1 /K to -0.149 ± 0.001 cm -1 /K as the Cr 2 O 3  content in the rubies increased from 0.022 to 1.676 wt%, which suggests a significant dependence on Cr 3+  concentration. At room temperature and atmospheric pressure, the full-width at half maximum (FWHM) of the peak height of the R lines also appears to be linearly related to the Cr 3+  concentration. The relative intensity ratios of the R 2  to R 1  lines (I 2 /I 1 ) of ruby samples with different Cr 3+  concentrations show several non-linear variations with temperature from 100 to 600 K, and the maximum values, (I 2 /I 1 ) max , occur near room temperature. The effect of Cr 3+  doping on the temperature dependence of the R line wavenumbers should be considered when rubies are used to calibrate the pressure or temperature in high-pressure and high-temperature experiments.

american mineralogist

Dependence of R fluorescence lines of rubies on Cr 3+  concentration at various temperatures, with implications for pressure calibrations in experimental apparatus