High-pressure Raman spectroscopy of diamond anvils to 250GPa: Method for pressure determination in the multimegabar pressure range

Akahama, Yuichi; Kawamura, Haruki

doi:10.1063/1.1778482

Cited by 278 publications

(173 citation statements)

References 10 publications

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“…[4] However, their choice of a relatively non-hydrostatic pressure medium makes it difficult to separate out other possible stress inducing effects on the diamond tip. This data fit is very similar to that from a study done by Popov, [3] which matches our 50 micron tip results up to 120 GPa and then nearly converges with Akahama et al [5] at much higher pressure. Unfortunately Eremets [1] did not report an equation with his fit to the data, but his results to appear to be consistent with this report.…”

Section: Resultssupporting

confidence: 79%

“…This is likely the case for many of the other previous reports that do not observe a culet geometry dependence. [3][4][5] Furthermore, the precision of pressure measurements without a quasihydrostatic medium, which is the case for many of these studies, add to their data scatter. A comparison of our three culet designs versus that of other experiments is shown in figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years it has been demonstrated that the Raman shift of the diamond tip at the sample-culet interface can serve as an in-situ pressure sensor at very high pressures [1][2][3][4][5] and be a useful alternative to the ruby luminescence standard. [6][7] This newer technique has the benefit of always having in place a pressure sensor very near the sample.…”

Section: Introductionmentioning

confidence: 99%

“…Applying these techniques has resulted in several different calibrations using a variety of functional forms. [2][3][4][5] The earliest published report detailing the use of the diamond anvil for pressure measurements went up to 30 GPa. [10] However, it has become increasingly common for diamond-anvil-cell experiments to exceed a megabar.…”

Section: Introductionmentioning

confidence: 99%

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Raman shift of stressed diamond anvils: Pressure calibration and culet geometry dependence

Baer

Chang

Evans

2008

Journal of Applied Physics

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Abstract:The pressure dependence of the Raman shift of diamond for highly stressed anvils at the diamond-anvil sample interface has been measured for different culet shapes up to 180 GPa at ambient temperature. By using hydrogen samples, which constitute both a quasi-hydrostatic medium and a sensitive pressure sensor, some of the effects of culet and tip size have been determined. We propose that the divergent results in the literature can be partly ascribed to different anvil geometries. Experiments show increasing second order dependence of the diamond Raman shift with pressure for decreasing tip size. This is an important consideration when using the diamond anvils as a pressure sensor. Introduction:

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Raman shift of stressed diamond anvils: Pressure calibration and culet geometry dependence

Baer

Chang

Evans

2008

Journal of Applied Physics

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“…Boppart, van Stratten, and Silvera 6 proposed using the high frequency wing extended to zero amplitude to determine and calibrate the pressure and this has been done by a number of researchers. [7][8][9][10][11] More recently Dubrovinskaia et al 12 have produced micrometer sized diamond markers embedded in the pressurization medium and provided a calibration to megabar pressures. Thus, we also include diamond markers in our study.…”

Section: Introductionmentioning

confidence: 99%

Pressure distribution in a quasi-hydrostatic pressure medium: A finite element analysis

Tempere

Silvera

2011

Journal of Applied Physics

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The highest quality pressures on samples in a diamond anvil cell (DAC) at high pressures are produced using quasi-hydrostatic pressurization media such as helium or hydrogen. In this paper we carry out a finite element analysis of pressure distributions in a DAC using helium and non-hydrostatic argon pressurization media. We find that samples and ruby chips are at substantially higher pressures than the pressurization media, although this is sharply reduced by using helium, which has a low yield strength for the shear modulus. The deviations in pressure of the different samples (and ruby) from the pressurization media differ and depend on their elastic constants. Our observations may account for the distribution of pressures in metallic markers found in a recent calibration of the ruby scale to high pressures.

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Melting experiments on peridotite to lowermost mantle conditions

2014

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Melting experiments on a pyrolitic mantle material were performed in a pressure range from 34 to 179 GPa based on laser-heated diamond-anvil cell (DAC) techniques. The textural and chemical characterizations of quenched samples were made by using field-emission-type electron microprobe (FE-EPMA). Melts formed by 46 to 77 wt.% partial melting in this study were ultrabasic in composition and became more depleted in SiO 2 and more enriched in FeO with increasing pressure. Melting textures indicate that the liquidus phase changed from ferropericlase to MgSiO 3 -rich perovskite at least above 34 GPa and further to post-perovskite. The first phase to melt (disappear) changed from CaSiO 3 perovskite to (Mg,Fe)O ferropericlase between 68 and 82 GPa. The stability of ferropericlase above solidus temperature shrinks with increasing pressure (melting last below 34 GPa and first 82 GPa), resulting in higher (MgO + FeO)/SiO 2 ratio in partial melt at higher pressure. Additionally, the Fe-Mg distribution coefficients (K D ) between perovskite/ post-perovskite and melt decreased considerably with increasing pressure, leading to strong Fe-enrichment in partial melts. It supports dense partial melts in a deep lower mantle, which migrate downward to the core mantle boundary (CMB).

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High-pressure Raman spectroscopy of diamond anvils to 250GPa: Method for pressure determination in the multimegabar pressure range

Cited by 278 publications

References 10 publications

Raman shift of stressed diamond anvils: Pressure calibration and culet geometry dependence

Raman shift of stressed diamond anvils: Pressure calibration and culet geometry dependence

Pressure distribution in a quasi-hydrostatic pressure medium: A finite element analysis

Melting experiments on peridotite to lowermost mantle conditions

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