PRESSURE MEASUREMENT AT HIGH-TEMPERATURE USING 10 SM-YAG FLUORESCENCEPEAKS

Citation
Yc. Zhao et al., PRESSURE MEASUREMENT AT HIGH-TEMPERATURE USING 10 SM-YAG FLUORESCENCEPEAKS, Journal of applied physics, 84(8), 1998, pp. 4049-4059
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
0021-8979
Volume
84
Issue
8
Year of publication
1998
Pages
4049 - 4059
Database
ISI
SICI code
0021-8979(1998)84:8<4049:PMAHU1>2.0.ZU;2-B
Abstract
A high-temperature pressure calibration technique using Sm-doped Y3Al5 O12 (Sm:YAG) crystal as the pressure calibrant has been developed by s tudying 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 temperatu res (T) from 20 to 850 degrees C in externally heated diamond anvil ce lls. The entire spectrum was fit to a sum of ten Lorentzians plus a li near background. The positions, relative intensities and widths were r epresented 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 (N-2) vibron press ure scales. A fitting routine is proposed that can determine p from 20 to 850 degrees C within an estimated uncertainty of 0.4 GPa. (C) 1998 American Institute of Physics. [S0021-8979(98)06019-8].