Thermodynamic Properties of Helium 4 from 2 to 1500 K at Pressures to 108 Pa

Carty, Robert D. Mc

doi:10.1063/1.3253133

Cited by 212 publications

(61 citation statements)

References 32 publications

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“…The solid-liquid transformation of bulk helium depends on the pressure p and temperature T [1][2][3][4][5][6]. The melting entropy is determined from the Clapeyron relation knowing the volume and melting temperature changes associated with the solid-to-liquid transformation under a pressure p [2].…”

Section: Introductionmentioning

confidence: 99%

4He glass phase: A model for liquid elements

Tournier

Bossy

2016

Chemical Physics Letters

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Abstract:The specific heat of liquid helium confined under pressure in nanoporous material and the formation, in these conditions, of a glass phase accompanied by latent heat are known. These properties are in good agreement with a recent model predicting, in liquid elements, the formation of ultrastable glass having universal thermodynamic properties. The third law of thermodynamics involves that the specific heat decreases at low temperatures and consequently the effective transition temperature of the glass increases up to the temperature where the frozen enthalpy becomes equal to the predicted value. The glass residual entropy is about 23.6% of the melting entropy. IntroductionThe solid-liquid transformation of bulk helium depends on the pressure p and temperature T [1-6]. The melting entropy is determined from the Clapeyron relation knowing the volume and melting temperature changes associated with the solid-to-liquid transformation under a pressure p [2]. The phase diagram is deeply modified when liquid helium is confined in 25Ǻ mean diameter nano-pore media under pressures p where 3.58 ≤ p≤ 5.27 MPa [7]. Early studies of these involved specific heat anomaly measurements and they were viewed as a consequence of the formation of localized Bose-Einstein condensates on nanometer length scales analogous to a solid [7]. The glass phase has since been discovered using measurements of the static structure factor, S(Q), of helium confined in the porous medium MCM-41 with pore diameter 47±1.5 Å. A similar amorphous S(Q) was also observed in 34 Å Gelsil [8]. The presence of an amorphous phase has been confirmed at higher pressures using porous Vycor glass [9]. In this work we consider that the supercooled liquid far below the melting temperature T m is condensed in a glass phase accompanied by an exothermic latent heat associated with a first-order transition.

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Section: Introductionmentioning

confidence: 99%

4He glass phase: A model for liquid elements

Tournier

Bossy

2016

Chemical Physics Letters

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“…The data of thermodynamic and transport properties of helium are generated from the equations of state presented in the references below [22][23][24]. The properties are density (ρ), energy (E), enthalpy (H), entropy (S), isochoric heat capacity (C v ), isobaric heat capacity (C p ), thermal conductivity (  ), viscosity (η), and dielectric constant (D).…”

Section: Training Process Of Neural Networkmentioning

confidence: 99%

Prediction of Thermophysical Properties of Helium Using Linear Prediction and Artificial Neural Networks

Yang¹,

Li²,

Zhou³

2014

IJCA

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“…These properties for 3 He and 4 He are taken from Huang et al [10,11] and McCarty [12], respectively. The compressibility curves for both 3 He and 4 He with respect to temperature are plotted in Figure 2.…”

Section: Properties Of the Two Helium Isotopesmentioning

confidence: 99%