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

Summary: Pressure measurement at high temperature using ten Sm:YAG
fluorescence peaks
Yuechao Zhao, William Barvosa-Carter,a)
Steven D. Theiss,b)
Salman Mitha,c)
and Michael J. Azizd)
Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
David Schiferl
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Received 5 September 1997; accepted for publication 6 July 1998
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

  

Source: Aziz, Michael J.- School of Engineering and Applied Sciences, Harvard University

 

Collections: Physics; Materials Science