A new method of absolute high pressure determination

Ruoff, Arthur L.; Lincoln, R. C.; Chen, Y C

doi:10.1088/0022-3727/6/10/315

Cited by 42 publications

(13 citation statements)

References 24 publications

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“…Uncertainties in shock-wave measurements, strengths of samples, assumptions of the volume dependence of the Grüneisen parameter, and the one-dimensional nature of shock waves all add to the uncertainty of the ruby scale. Alternatively, it is possible to develop a primary pressure scale by combining direct measurements of elasticity and density, but until recently this has been limited to very low pressures (29). Recent integration of Brillouin scattering and x-ray diffraction techniques has provided a direct pressure determination to 32 GPa (3), and demonstrated good agreement between the ruby scale and Brillouin͞x-ray measurements over this range.…”

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confidence: 99%

Elasticity of MgO and a primary pressure scale to 55 GPa

Zha

Mao

Hemley

2000

Proc. Natl. Acad. Sci. U.S.A.

427

286

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We have studied the elasticity and pressure-density equation of state of MgO in diamond cells to 55 GPa and have doubled the previous pressure limit of accurate elasticity determinations for crystals. Integrating single-crystal velocity data from Brillouin scattering measurements and density data from polycrystalline x-ray diffraction, we obtained the three principal elastic tensor elements (C11, C12, and C44) and various secondary elasticity parameters, including single-crystal elastic anisotropy, Cauchy relation, aggregate sound velocities, and Poisson's ratio, as functions of pressure. The present study also provides a direct determination of pressure without recourse to any prior pressure standard, thus creating a primary pressure scale. The commonly used ruby fluorescence pressure scale has thus been improved to 1% accuracy by the new MgO scale. E lasticity, the fourth-rank tensor defining the strain of crystalline solids under stress (1), contains key parameters relating the microscopic bonding properties to the macroscopic mechanical behaviors of the solid under compression. The study of elasticity under high pressure has wide applications in fields ranging from crystal physics to seismology (2). Direct experimental measurements of the tensor elements, however, have previously been limited to 32 GPa (3)-above this pressure our knowledge has been derived from theoretical predictions, extrapolations of lower pressure data, or indirect measurements with assumed stress͞strain conditions (4). In the present study, we extend measurements of the elasticity of MgO, an archetypal oxide with the simple NaCl-type (B1) crystal structure, to 55 GPa at 300 K.MgO has been the subject of extensive theoretical and experimental investigations (5-17) that have revealed the fundamental bonding properties in this class of materials. With the wealth of available data, MgO is often used as a test ground for new theories, new experiments, and even as a pressure calibration standard for high-pressure, high-temperature experimentation (18,19). Moreover, MgO is a major component in the Earth's lower mantle (20,21), and knowledge of its high-pressure behavior is crucial for understanding deep Earth geophysics. The crystal structure and volume compression of polycrystalline MgO samples without pressure media have been studied with x-ray diffraction in diamond cells up to 227 GPa (7,22, 23). MgO in the B1 structure is stable over the entire pressure range. Nonhydrostatic conditions in these measurements, however, may introduce systematic deviations in pressure of up to 10% in the pressure-density equations of state (22-24). Ultrasonic and Brillouin scattering studies of single-crystal MgO (8,16,25) have yielded detailed information on its elastic tensor, anisotropy, and aggregate shear and bulk moduli, but have been limited to a maximum pressure of 18.6 GPa. Evidence for nonhydrostaticity has also been found in previous Brillouin scattering experiments at pressures exceeding the hydrostatic limits of the pressure media used in these s...

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mentioning

confidence: 99%

Elasticity of MgO and a primary pressure scale to 55 GPa

Zha

Mao

Hemley

2000

Proc. Natl. Acad. Sci. U.S.A.

427

286

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“…A heater in the sample assembly allows simultaneous temperatures of >1200 C (Higo et al, 2006). Because this device allows velocity, sample length, and, hence, volume to be measured in a single experiment, it is possible to obtain the pressure on the sample directly (Ruoff et al, 1973). A synchrotron X-ray beam is directed through the space between the WC anvils and the transmitted beam is recorded via a YAG crystal (serving as a fluorescent screen) and detector.…”

Section: High-pressure Ultrasonicsmentioning

confidence: 99%

“…This capability has recently been developed at the GSECARS (Sector 13) beam line of the advanced photon source (Sinogeikin et al, 2006), and should allow the development of improved pressure scales for high-pressure research (Ruoff et al, 1973). This capability has recently been developed at the GSECARS (Sector 13) beam line of the advanced photon source (Sinogeikin et al, 2006), and should allow the development of improved pressure scales for high-pressure research (Ruoff et al, 1973).…”

Section: Brillouin Scatteringmentioning

confidence: 99%

Theory and Practice – Techniques for Measuring High P/T Elasticity

Bass

2007

Treatise on Geophysics

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“…Pressure measurements were made with a manganin cell which had been calibrated against the new absolute pressure gauge system developed by Lincoln [12].…”

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confidence: 99%

Elastic moduli of precompressed pyrophyllite used in ultrahigh-pressure research

Sachse

Ruoff²

1975

Journal of Applied Physics

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Chao and Ruoff [*] have shown previously that by precompressing pyrophyllite prior to its use in high-pressure applications, one obtains a material which has a uniform density and uniform mechanical properties. We have recently studied the propagation of u trasonir nplIse~ in pyrnphyllit.p specimens to investigate the effect of specimen precompression on the.measured elastic moduli. Measurements were made at room pressure and, for the precompressed specimens, to pressures of 3 kbar.We find pyrophyllite to be elastically anisotropic, apparently the result of the fabric present in our material. The room pressure adiabatic bulk modulus as measured on specimens made of isostatically compacted powdered pyrophyllite was determined to be 96.1 kbar. We found the wave speeds of.ultrasonic pulses in pyrophyllite to decrease with increasing specimen precompression. A limiting value of precompression was found, above which no further decrease in wave speed is observed. For the shear wave speeds this occurs at 10 kbar while for the longitudinal wave at 25 kbar. In the limit, the shear waves propagate

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A new method of absolute high pressure determination

Cited by 42 publications

References 24 publications

Elasticity of MgO and a primary pressure scale to 55 GPa

Elasticity of MgO and a primary pressure scale to 55 GPa

Theory and Practice – Techniques for Measuring High P/T Elasticity

Elastic moduli of precompressed pyrophyllite used in ultrahigh-pressure research

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