Improved calibration of the {bold SrB}{sub 4}{bold O}{sub 7}{bold :Sm}{sup 2+} optical pressure gauge: Advantages at very high pressures and high temperatures

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365025· OSTI ID:496390

Datchi, F; LeToullec, R; Loubeyre, P ^[1]

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1. Physique des Milieux Condenses, T13 E4, Universite Paris 6, 4 place Jussieu, 75252 Paris Cedex 05 (France)

This paper presents a new calibration of the pressure shift of the {sup 7}D{sub 0}{minus}{sup 5}F{sub 0} fluorescence line of SrB{sub 4}O{sub 7}:Sm{sup 2+}, in hydrostatic medium (helium) up to 124 GPa and in nonhydrostatic medium (H{sub 2}O) up to 130 GPa. There is no quenching of the luminescence, in contrast to that observed in similar compounds. We show that this line permits more accurate pressure measurements at very high pressure than the commonly used R{sub 1} emission line of ruby because it remains intense, sharp, well isolated from the other lines, and weakly dependent on nonhydrostaticity. The wavelength pressure shift of the {sup 7}D{sub 0}{minus}{sup 5}F{sub 0} line is found to be very well represented by the nonlinear relation: P=4.032{Delta}{lambda}(1+9.29{times}10{sup {minus}3}{Delta}{lambda})/(1+2.32{times}10{sup {minus}2}{Delta}{lambda}) with P in GPa and {Delta}{lambda}={lambda}{minus}685.41 in nm. High temperature experiments up to 900 K at room pressure were also performed. The negligible temperature dependence and the small thermal line broadening are further advantages for high pressure{endash}high temperature studies in diamond anvil cells. A metrology for {ital in situ} measurements of pressure and temperature, based on the combined use of this compound with ruby is also presented, along with a new calibration of the ruby R{sub 1} frequency shift with temperature from 300 to 800 K. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496390
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
BORON OXIDES
CALIBRATION
FLUORESCENCE
OPTICAL SYSTEMS
PRESSURE MEASUREMENT
SAMARIUM
SAMARIUM IONS
SPECTRAL SHIFT
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE RANGE 0400-1000 K
VERY HIGH PRESSURE