Pressure measurement at high temperature using ten Sm:YAG fluorescence peaks
- Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
A high-temperature pressure calibration technique using Sm-doped Y{sub 3}Al{sub 5}O{sub 12} (Sm:YAG) crystal as the pressure calibrant has been developed by studying its Y1 through Y10 fluorescence peaks (frequencies from 15 600 to 17thinsp200 cm{sup {minus}1}) at pressures ({ital p}) from 1 bar to 19 GPa and temperatures ({ital T}) from 20 to 850thinsp{degree}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 {ital p} and {ital T}. Several fitting routines for {ital p} determination were created based on these dependences, and were tested on various high-{ital p} and high-{ital T} experimental Sm:YAG fluorescence spectra. The {ital p} values obtained from the fitting routines are compared with those obtained from the ruby and the nitrogen (N{sub 2}) vibron pressure scales. A fitting routine is proposed that can determine {ital p} from 20 to 850thinsp{degree}C within an estimated uncertainty of 0.4 GPa. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 659296
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 84; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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