Pressure measurement at high temperature using ten Sm:YAG fluorescence peaks

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...

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Bibliographic Details
Published in:Journal of applied physics 1998-10, Vol.84 (8), p.4049-4059
Main Authors: Zhao, Yuechao, Barvosa-Carter, William, Theiss, Steven D., Mitha, Salman, Aziz, Michael J., Schiferl, David
Format: Article
Language:English
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.368693