The dielectric constant in liquid and solid4He

Chan, Moses H. W.; Ryschkewitsch, M. G.; Meyer, Horst

doi:10.1007/bf00654569

Cited by 40 publications

(18 citation statements)

References 19 publications

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“…0.7397 , were from the same batch used by Weber for p, , T, x measurements. 8 The carbon dioxide and ethane were both research grade materials supplied by Matheson Gas Products Inc. with a stated minimum mole fraction purity of 0.99995 and 0.9996, respectively. We used a diaphragm pump to compress these samples Ž .…”

Section: Younglove᎐straty Capacitormentioning

confidence: 99%

Phase border and density determinations in the critical region of (carbon dioxide+ethane) determined from dielectric permittivity measurements

Goodwin

Moldover

1997

The Journal of Chemical Thermodynamics

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Section: Younglove᎐straty Capacitormentioning

confidence: 99%

Phase border and density determinations in the critical region of (carbon dioxide+ethane) determined from dielectric permittivity measurements

Goodwin

Moldover

1997

The Journal of Chemical Thermodynamics

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“…Non-visual methods, that require small (<100 cm 3 particularly suited to automation, have been developed to determine the presence of a phase transition. These include measurements of refractive index with fibre-optic cables [1], evanescent waves at GHz frequencies [2], and relative permittivity [3][4][5][6][7]. The latter, determined with a radio frequency re-entrant cavity, was previously used by Goodwin et al [6,7] to determine phase boundaries, and is the subject of this work.…”

Section: Introductionmentioning

confidence: 98%

A re-entrant resonator for the measurement of phase boundaries: dew points for {0.4026CH4+0.5974C3H8}

Kandil

Marsh

Goodwin

2005

The Journal of Chemical Thermodynamics

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“…With such a temperature regulation, the capacitance bridge stability has been found to be usually about 8R/R = +1 • 10 -9, for conditions similar to those in Ref. 24, which corresponds to a resolution 6( 9 9149 ~ 5 X 10 -9. This in turn signifies a resolution of 8X-~ • x 10 -7.…”

Section: Ro(t)-cot+co B R(t) Etcot+abco~mentioning

confidence: 81%

Concentration susceptibility of 3He-4He mixtures near the superfluid transition

Ryschkewitsch

Meyer

1979

J Low Temp Phys

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Measurements of the concentration susceptibility )~ = (0X/0A)T are reported for 3He-4He mixtures at saturated vapor pressure and at constant mole fraction X(3He) as a function of temperature. Here d is the isotopic difference in chemical potentials. The mixtures cover the range from X = 0.60 to X = 0.677. Particular emphasis is given to the region near the lambda line for three miictures and to the region close to the tricritical point. The method makes use of the vertical concentration gradient induced in the mixture by gravity. This difference 6X is measured via the dielectric constant over a height o]=2 mm using a capacitance technique. The predicted peak of the susceptibility at the superfluid transition is observed and as the tricritical point is approached, this peak is progressively broadened by gravity effects. The data are compared with those from other methods and also with estimations based on calorimetric data for more dilute mixtures. The susceptibility data are transformed into results along a path at constant chemical potential A. Sufficiently close to Tx, these can be fitted to an expression with a weakly singular term, which is consistent with the predictions on the grounds of universality. These predictions are based on the calorimetric data of more dilute mixtures. The width of this critical region is found to be consistent with theoretical estimations by Riedel, Meyer, and Behringer. The tricritical scaling scheme by these authors is tested by the new data and the resulting scaling curve is found to be in reasonable agreement with that obtained from earlier data by Goellner, Behringer, and Meyer, except in the region closest to the tricritical point. There the new data appear to be more consistent with measurements from light scattering. In addition, the concentration susceptibility for more dilute mixtures (0.05

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The dielectric constant in liquid and solid4He

Cited by 40 publications

References 19 publications

Phase border and density determinations in the critical region of (carbon dioxide+ethane) determined from dielectric permittivity measurements

Phase border and density determinations in the critical region of (carbon dioxide+ethane) determined from dielectric permittivity measurements

A re-entrant resonator for the measurement of phase boundaries: dew points for {0.4026CH4+0.5974C3H8}

Concentration susceptibility of 3He-4He mixtures near the superfluid transition

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