Pressure Measurements with the Mercury Melting Line Referred to ITS-90

Molinar, G F; Bean, Vern E.; Houck, J. C.; Welch, B. E.

doi:10.1088/0026-1394/28/4/008

Cited by 8 publications

(12 citation statements)

References 5 publications

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“…Despite these differences, the values found are substantially the same, each being within the experimen-tal uncertainty of the other and within the quoted uncertainty of the current accepted value. 5,9,10 The best value of the 1953 experiment is closer to the accepted value than that of 1962. The 1953 error band is larger because only the smaller prototype dead weight tester was available at the time.…”

Section: ͑8͒mentioning

confidence: 61%

Revised characterization of the controlled clearance piston gauge

Newhall¹,

Newhall²,

Malloy³

2003

Review of Scientific Instruments

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A revised equation is presented for the effective piston area of controlled clearance deadweight testers from the theory of elasticity which accounts for the semi-infinite loading of the measured pressure cylinder. The concept of pressure transmissibility expressed in terms of transmission delay threshold pressure and the importance in the choice of operating fluids is discussed. Test results illustrating pressure transmissibility for 25 different fluids at pressure between 138 MPa ͑20 000 psi͒ and 1380 MPa ͑200 000 psi͒ are presented, together with proposed ranking of the fluids based on their relative pressure transmissibility. The linear nature of the stall curve with fluids of high transmissibility and the resulting linear nature of the adjustments to the effective area are shown. The linearity allows the use of considerable extrapolation for making reasonable estimates of effective area, where direct knowledge of the slope of the stall curve is not known. The robustness of the new equation is demonstrated by applying the equation to data from two mercury point experiments at Harwood ͑9 years apart͒, several National Institute of Standards and Technology ͑NIST͒ characterizations of controlled clearance gauges, some other experiments at Harwood, and the data from NIST's experiment using a controlled clearance piston gauge to isolate the transition pressure of bismuth from Bi I to Bi II. The conclusions reached indicate that with suitable operating fluids, there is a negligibly small difference between pressure values calculated from the method discussed here and that used by NIST based on experimental determination of the jacket pressure coefficient.

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Section: ͑8͒mentioning

confidence: 61%

Revised characterization of the controlled clearance piston gauge

Newhall¹,

Newhall²,

Malloy³

2003

Review of Scientific Instruments

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“…We then decompressed the DAC at a similar rate to a pressure of ~0.9 GPa. In both compression and decompression paths, we continuously measured luminescence signals every 0.25 seconds, while the mercury sample crossed its melting point [22]. In a pressure interval of 0.6 GPa, our compression (or decompression) rates allowed us to record 600-6000 luminescence spectra, providing fine recordings of the pressure conditions in the sample chamber.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the melting of pure H 2 O, Grasset [18] calibrated the ruby's R1-line shift in a pressure range of 0-1 GPa, resulting in a linear coefficient of 0.371±0.006 nm/GPa with a relative uncertainty of ±1.6%. Here, we report the calibration of the ruby luminescence line shift from the well-calibrated melting line of mercury which has a high precision of less than ±0.2 MPa [21,22]. The first AIRAPT task group on the International Practical Pressure Scale (IPPS) recommended the mercury melting line [21] be used as a pressure standard up to 1.2 GPa.…”

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Calibration of ruby (Cr³⁺:Al₂O₃) and Sm²⁺:SrFCl luminescence lines from the melting of mercury: constraints on the initial slopes

Shen

Smith

Kenney‐Benson

et al. 2021

High Pressure Research

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We have measured the luminescence shifts of the ruby's R1-and R2-lines and the line of 5 D 0 → 7 F 0 from Sm 2+ :SrFCl corresponding to the melting pressure of mercury that is recommended by the AIRAPT task force as an International Practical Pressure Scale (IPPS). The linear coefficients of the pressure dependence of the R1-, R2-lines, and the luminescence line of Sm 2+ :SrFCl are determined to be 0.3722±0.002 nm/GPa, 0.3796±0.002 nm/GPa, and 1.123±0.002 nm/GPa, respectively. The results not only put tight constraints on the initial slopes of ruby and Sm 2+ :SrFCl gauges, but also link the luminescence-based pressure gauges to the more fundamental primary piston gauges.

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“…Pressure was applied in piston-cylinder devices with internal diameters of 45 mm and the load was supplied by hydraulic presses. Values for the pressure, p, were calculated from the load using an empirical function obtained using a manganin pressure gauge calibrated against the Hg melting line [15]. The cylinders could either be cooled using liquid nitrogen or heated electrically and the temperature, T, was measured using a calibrated type K thermocouple close to the upper electrode.…”

Section: Equipmentmentioning

confidence: 99%

Ac impedance of A₄C₆₀fullerides under pressure

et al. 2015

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Three A 4 C 60 compounds, with A = Li, Na and K, have been studied by impedance spectroscopy between 100 and 293 K at pressures up to 2 GPa. The results are in very good agreement with earlier dc resistance studies and with data from the literature. For all three materials the measured conductivity can be fitted by a sum of at least two Arrhenius terms. The band gaps derived from the resistance data, 0.3 eV for Na 4 C 60 and 0.5 eV for K 4 C 60 , are in excellent agreement with data measured by other methods. For Li 4 C 60 , our results disagree with a recent suggestion that the conductivity is dominated by ionic conduction. Although a certain ionic component probably exists we suggest that electronic transport dominates in our samples at and below room temperature because the derived 'activation energy' decreases under pressure, the derived 'activation volume' is negative, and we observe neither a significant electrode blocking capacitance nor any significant metal transport under dc conditions. changes in conductivity magnitude might be due to changes in the sample geometry there remained possibilities that the results were modified by deintercalation due to heating, ionic electrotransport, or both.We present here new data for the resistivity of A 4 C 60 under pressure for A = Li, Na and K, measured by ac impedance spectroscopy. Using an ac method in a mechanically very stable experimental set-up proved to yield very stable and repeatable results, and the derived transport parameters (excitation energies and/or band gaps) were very similar to those found earlier. This confirms that the large changes in magnitude observed earlier were experimental artifacts caused mainly by deformation of the samples. To investigate ionic transport in Li 4 C 60 further we also carried out a simple dc experiment, driving a small dc current through a sample sandwiched between lithium electrodes. After 50 h, no change was detected in the relative weights of the electrodes, showing that most of the current was carried by electrons rather than Li + ions.

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Pressure Measurements with the Mercury Melting Line Referred to ITS-90

Cited by 8 publications

References 5 publications

Revised characterization of the controlled clearance piston gauge

Revised characterization of the controlled clearance piston gauge

Calibration of ruby (Cr³⁺:Al₂O₃) and Sm²⁺:SrFCl luminescence lines from the melting of mercury: constraints on the initial slopes

Ac impedance of A₄C₆₀fullerides under pressure

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Pressure Measurements with the Mercury Melting Line Referred to ITS-90

Cited by 8 publications

References 5 publications

Revised characterization of the controlled clearance piston gauge

Revised characterization of the controlled clearance piston gauge

Calibration of ruby (Cr3+:Al2O3) and Sm2+:SrFCl luminescence lines from the melting of mercury: constraints on the initial slopes

Ac impedance of A4C60fullerides under pressure

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Calibration of ruby (Cr³⁺:Al₂O₃) and Sm²⁺:SrFCl luminescence lines from the melting of mercury: constraints on the initial slopes

Ac impedance of A₄C₆₀fullerides under pressure