Freezing and lambda curves of 3He-4He mixtures

Pair, C. Le; Taconis, K.W.; Ouboter, R. de Bruyn; Das, Punyatoya

doi:10.1016/0031-8914(62)90051-4

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…This effect was first observed by Elliott. 24 Further investigation [30][31][32] of this effect in the temperature range below 1°K have shown the existence of a minimum in the solidification curves. Also, as was expected from entropy calculations, a minimum in the solidification curve for pure He 4 has been observed.…”

Section: Melting and Solidification Curvesmentioning

confidence: 99%

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
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Using the ultrasonic pulse technique at a carrier frequency of 10 Mc/sec, we have measured the longitudinal velocity of sound in liquid and solid He 8 , He 4 , and He 3 -He 4 mixtures (0.0, 5.03, 25.0, 74.9, 98.00, 99.84% He 3 ) in the temperature range from 1 to 4.2°K and the pressure range from 1 to 150 atm. An upper limit to the attenuation of sound in the region of the solid investigated is on the order of 0.3 to 0.7 cm -1 . Values of the adiabatic compressibility of the liquid along the melting curve of He 4 are given. The discontinuity in the propagation velocity at a first-order phase boundary was utilized to locate the solidification curves of these samples and also to investigate the bcc-hcp crystallographic transition in solid samples, including pure He 4 , similar to that observed in pure He 3 by Grilly and Mills. The triple points for this transition in He 4 are given by T t = 1.449±0.003°K, P* = 26.18=fc0.05 atm; T u = 1.778db0.003°K, P"=30.28±0.05 atm. The upper triple points for the mixtures lie on a straight line connecting He 3 and He 4 in temperaturepressure space. In addition, by observing the peak in the attenuation of sound, it was possible to measure the X line in He 4 and in the 5.0% and 25.0% He 8 liquid mixtures. The upper X point for pure He 4 is given by T a = 1.765db0.003°K and P a = 29.90:fc0.05 atm. Comparison is made with existing data wherever possible.

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Section: Melting and Solidification Curvesmentioning

confidence: 99%

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
View full text Add to dashboard Cite

show abstract

“…The complete phase diagram is one of the most complicated known for a binary system, since we have not only liquid-liquid equibrium but also azeotropy 301 , a ^-surface 302 which is a function of p, T and x, a tricritical point, and freezing of both components at higher pressures to more than one solid phase 302 . At high temperatures, isotopic mixtures of heavy molecules are perhaps the best examples we have of ideal mixtures, and remain so at temperatures down to the melting curves.…”

Section: Mixtures Of Quantum Liquidsmentioning

confidence: 99%

Excess thermodynamic functions

Rowlinson

1982

Liquids and Liquid Mixtures

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The phase diagram of freezing helium-3-helium-4 mixtures

Pair¹,

Taconis²,

Das³

et al. 1963

Cryogenics

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Freezing and lambda curves of 3He-4He mixtures

Cited by 7 publications

References 7 publications

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
View full text Add to dashboard Cite

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
View full text Add to dashboard Cite

Excess thermodynamic functions

The phase diagram of freezing helium-3-helium-4 mixtures

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Freezing and lambda curves of 3He-4He mixtures

Cited by 7 publications

References 7 publications

Sound Measurements in Liquid and SolidHe3,He4, andVignos1, Fairbank2 1966Phys. Rev.671140View full textAdd to dashboardCite

Sound Measurements in Liquid and SolidHe3,He4, andVignos1, Fairbank2 1966Phys. Rev.671140View full textAdd to dashboardCite

Excess thermodynamic functions

The phase diagram of freezing helium-3-helium-4 mixtures

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Product

Resources

About

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
View full text Add to dashboard Cite

Sound Measurements in Liquid and SolidHe3,He4, and
Vignos
¹
,
Fairbank
²

1966
Phys. Rev.
67
1
14
0
View full text Add to dashboard Cite