An apparatus for high pressure Raman spectroscopy

Hawke, R.S.; Syassen, K.; Holzapfel, W. B.

doi:10.1063/1.1686569

Cited by 71 publications

(8 citation statements)

References 4 publications

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“…In the early 1970s, the process was turned around somewhat, and the details of crystal field theory were overtaken by empirical advances. In particular, calibrated experimental determination of shifts in the R1 and R2 line energies, , as a function of hydrostatic pressure [16][17][18][19][20][21][22] became the standard method for measuring pressure in high-pressure experiments involving the diamond anvil cell (DAC)-a method that continues to this day [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], although not without debate regarding calibration coefficients. (Here and throughout, citations within a topic are given in chronological order of publication.)…”

Section: Introductionmentioning

confidence: 99%

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Cook

Michaels

2017

J. RES. NATL. INST. STAN.

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The numerical coefficients linearly relating the effects of stress (including pressure), temperature, and composition to shifts in the energies of the Cr-related fluorescence in alumina (Al2O3) are reviewed. The primary focus is the shift of the R1 and R2 “ruby” fluorescence lines under conditions typical for stress determination in polycrystalline Al2O3. No significant experimental difference in the R1 and R2 responses is observed for hydrostatic stress (or pressure) conditions (average shift coefficient of about 7.6 cm−1/GPa), changes in temperature (about 0.140 cm−1/K), or variations in composition (about 120 cm−1/mass fraction of Cr). There are significant differences in the R1 and R2 responses for nonhydrostatic stress conditions. In particular, for uniaxial stress along the a and c directions in the Al2O3 crystal, the R1 piezospectroscopic tensor coefficients (about 3.0 cm−1/GPa and 1.6 GPa cm−1/GPa, respectively) differ considerably, whereas the R2 coefficients (about 2.6 cm−1/GPa and 2.3 GPa cm−1/GPa, respectively) do not. Measurements of the piezospectroscopic tensor coefficients are shown to have interlaboratory relative consistency of about 4 % extending over 30 years, and are consistent with the scalar high-pressure measurements. Measurements of the temperature coefficients are shown to have interlaboratory relative consistency less than 1 % extending over 60 years. Fluorescence-based measurements of stress in polycrystalline Al2O3, although requiring temperature adjustment, are shown to have a relative uncertainty of about 2.5 %.

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Section: Introductionmentioning

confidence: 99%

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Cook

Michaels

2017

J. RES. NATL. INST. STAN.

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“…Pressure Cell. A sapphire pressure cell was developed for hydrostatic PS coef® cient evaluation, after Hawke et al 15 with som e m odi® cations. In high-pressure experiments, a diamond anvil cell has becom e a standard device.…”

Section: Exp Erim Entalmentioning

confidence: 99%

Pressure Dependence of Laser-Induced Fluorescence of Sm³⁺ in Al₂O₃—Y₂O₃ System Compounds

et al. 1999

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The piezospectroscopic (PS) coefficients relating frequency shift to pressure are evaluated for Sm3+ in the Al2O3–Y2O3 system compounds, which include Al2O3, Y3Al5O12, YAlO3, Y4Al2O9, and Y2O3. The fluorescence peaks are inherently narrow for all the synthesized compounds, on the basis of the f–f transition nature of Sm3+ ion. Furthermore, the PS coefficients are ranged from −2.2 to −8.2 cm−1/GPa, which are similar to the reported value for the R1 line of ruby and suitable for the PS stress evaluation. PS stress distribution measurements are demonstrated with sintered Y3Al5O12 ceramics as a sample, with 50 μm intervals, under a microscope.

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“…Single-crystal sapphire has been used in a similar manner to over 80 kilobars in a high-pressure Raman apparatus but with slightly smaller samples. 9 Sample thickness must be as small as 0.1 mm to avoid being smashed at the very highest pressures. cell are constructed from heat-treated beryllium-copper alloy.…”

Section: Design Of Esr Pressure Cellmentioning

confidence: 99%

System for ESR measurements at hydrostatic pressures to 60 kilobars

Barnett

Tyagi

Nelson

1978

Review of Scientific Instruments

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A single-crystal sapphire serves both as a solid microwave cavity (X band) and an anvil in a Bridgman-anvil pressure geometry. A metal gasket is used in a manner similar to its use in the diamond-anvil pressure cell, and single-crystal samples are subject to purely hydrostatic pressures. The ruby-fluorescence pressure-measurement technique is utilized. Sample size is limited to a disk approximately 0.6 mm in diameter and 0.1 mm thick. ESR data on Cr(3+) in ruby to 60 kilobars are given as an illustration of the precision and data quality. Line widths and profiles, as well as line positions, are meaningful. Very little degradation of the data is experienced at the higher pressures. The first and second derivatives of the zero-field splitting (delta) of the states in ruby with pressure are measured as ddelta/dP= (6.70+/-0.08) x 10(-4) cm(-1) kilobar(-1) and d(2)delta/dP(2)= (-2.44+/-0.30) x10(-6) cm(-1) kilobar(-2) at P=0. The gyromagnetic ratio g(11) is shown to experience a fractional change less than 2 x 10(-4) to 60 kilobars.

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An apparatus for high pressure Raman spectroscopy

Cited by 71 publications

References 4 publications

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Pressure Dependence of Laser-Induced Fluorescence of Sm³⁺ in Al₂O₃—Y₂O₃ System Compounds

System for ESR measurements at hydrostatic pressures to 60 kilobars

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An apparatus for high pressure Raman spectroscopy

Cited by 71 publications

References 4 publications

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Pressure Dependence of Laser-Induced Fluorescence of Sm3+ in Al2O3—Y2O3 System Compounds

System for ESR measurements at hydrostatic pressures to 60 kilobars

Contact Info

Product

Resources

About

Pressure Dependence of Laser-Induced Fluorescence of Sm³⁺ in Al₂O₃—Y₂O₃ System Compounds