Pressure Measurement at High Temperature Using Ten Sm:YAG Fluorescence Peaks

Zhao, Yuechao; Aziz, Michael; Barvosa-Carter, William; Theiss, Steven D.; Mitha, Salman; Shiferl, David

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Author

Zhao, Yuechao

Aziz, Michael HARVARD

Barvosa-Carter, William

Theiss, Steven D.

Mitha, Salman

Shiferl, David

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Published Version

https://doi.org/10.1063/1.368693

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Citation

Zhao, Yuechao, William Barvosa-Carter, Steven D. Theiss, Salman Mitha, Michael J. Aziz, and David Schiferl. 1998. Pressure measurement at high temperature using ten Sm:YAG fluorescence peaks. Journal of Applied Physics 84(8): 4049-4059.

Abstract

A high-temperature pressure calibration technique using Sm-doped Y₃Al₅O₁₂ (Sm:YAG) crystal as the pressure calibrant has been developed by studying its Y1 through Y10 fluorescence peaks (frequencies from 15 600 to 17 200 cm^–1) at pressures (p) from 1 bar to 19 GPa and temperatures (T) from 20 to 850 °C in externally heated diamond anvil cells. The entire spectrum was fit to a sum of ten Lorentzians plus a linear background. The positions, relative intensities and widths were represented by empirical functions of p and T. Several fitting routines for p determination were created based on these dependences, and were tested on various high-p and high-T experimental Sm:YAG fluorescence spectra. The p values obtained from the fitting routines are compared with those obtained from the ruby and the nitrogen (N₂) vibron pressure scales. A fitting routine is proposed that can determine p from 20 to 850 °C within an estimated uncertainty of 0.4 GPa.