Optimization of Sm~(3+) fluorescence in Sm-doped yttrium aluminum garnet: Application to pressure calibration in diamond-anvil cell at high temperature

摘要

Sm~(3+) concentration in Sm-doped yttrium aluminum garnet (Sm~(3+):YAG) has been optimized for fluorescence yield and synthesis procedure for the production of strain-free small grain-size powder established. Concentration of 0.5 wt Sm~(3+) displays an optimal fluorescence signal, three to five times stronger than the generally proposed concentration (4 wt ). The fluorescence of the samples has been studied as a function of temperature (300-873 K) and pressure (0-15 GPa). A comparison with standard pressure scales shows that the pressure evolution of Sm~(3+):YAG fluorescence is insensitive to the doping rate, and that temperature has only a limited effect on the pressure scale established at 300 K. The present results indicate that pressure can be determined from the Y_(1) line of 0.5 wt Sm-doped YAG, with temperature correction for ω at room pressure and constant pressure shift, within the 300-873 K and 10~(-4) - 15 GPa pressure-temperature range, through the linear relation: P (GPa)=0.127×(ω_(0)-0.018×ΔT)-ω where ω_(0) corresponds to the Y_(1) frequency value at ambient conditions (16 185 cm~(-1)).