Improved calibration of the SrB4O7:Sm2+ optical pressure gauge: Advantages at very high pressures and high temperatures

摘要: This paper presents a new calibration of the pressure shift 7D0−5F0 fluorescence line SrB4O7:Sm2+, in hydrostatic medium (helium) up to 124 GPa and nonhydrostatic (H2O) 130 GPa. There is no quenching luminescence, contrast that observed similar compounds. We show this permits more accurate measurements at very high than commonly used R1 emission ruby because it remains intense, sharp, well isolated from other lines, weakly dependent on nonhydrostaticity. The wavelength found be represented by nonlinear relation: P=4.032Δλ(1+9.29×10−3Δλ)/(1+2.32×10−2Δλ) with P Δλ=λ−685.41 nm. High temperature experiments 900 K room were also performed. negligible dependence small thermal broadening are further advantages for pressure–high studies diamond anvil cells. A metrology situ measuremen...