Pressure and temperature dependence of laser-induced fluorescence of Sm:YAG to 100 kbar and 700 degree C and an empirical model
- Pacific Northwest Laboratory, Richland, WA (USA)
- Los Alamos National Laboratory, Los Alamos, NM (USA)
The inability to measure pressure with accuracy at high temperature has been a hindrance to the development of simultaneous high-temperature, high-pressure experimental techniques. The results of recent laser-induced fluorescence studies at high temperature and high pressure indicate that Sm:YAG is a promising pressure calibrant with very low-temperature sensitivity. The most intense feature in the fluorescence spectrum is a doublet at 16186.5 cm{sup {minus}1}. The Sm:YAG doublet exhibits a pressure-induced peak shift comparable to the {ital R}{sub 1} shift of ruby. However, the temperature-induced shift of the doublet is almost two orders of magnitude less than that observed for the {ital R}{sub 1} peak. Simultaneous high-pressure-temperature experiments indicate that the pressure and temperature effects on the frequency and line shape can be added linearly. An empirical model based on the linear combination of pressure dependent frequency shift and temperature dependent linewidth and intensity ratio successfully predicts the doublet line shape at simultaneous pressure and temperature. Use of the model facilitates measurement of peak position at high temperature resulting in improved accuracy and repeatability of the pressure determination. Pressure measurements at 400 {degree}C and 40 kbar based on the Sm:YAG doublet peak position agree with the temperature-corrected ruby {ital R}{sub 1} pressure measurement to within 3 kbar. At 15 kbar and 900 {degree}C the uncertainty in the Sm:YAG fluorescence peak wavelength is 5 cm{sup {minus}1} due to temperature-induced line broadening; this corresponds to an uncertainty in the pressure determination of {plus minus}2.5 kbar. The high thermal and chemical stability of YAG materials make Sm:YAG an ideal pressure calibrant for high-temperature applications.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6381523
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:5; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ruby and Sm:YAG fluorescence pressure gauges up to 120 GPa and 700 K
Pressure measurement at high temperature using ten Sm:YAG fluorescence peaks
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
DOPED MATERIALS
ELECTROMAGNETIC RADIATION
ELEMENTS
FERRITE GARNETS
FLUORESCENCE
HIGH TEMPERATURE
LASER RADIATION
LUMINESCENCE
MATERIALS
MATHEMATICAL MODELS
METALS
MINERALS
PRESSURE DEPENDENCE
RADIATIONS
RARE EARTHS
SAMARIUM
SILICATE MINERALS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS