Specific heats of solid natural neon at five molar volumes and of the separated neon isotopes atP=0

The alloy of Ne -5.1% n-H 2 was investigated calorimetrically under equilibrium vapor pressure in an interval of 0.9-25 K. The magnitudes and the temperatures dependencies of the heat capacity C T sol ( )of the alloy at T = 11-20 K are strongly dependent on the conditions of sample preparation. The temperatures dependencies of the C T sol ( ) of the sample prepared in a calorimeter by direct condensation of a gas mixture at T » 15 K exhibit a smeared maximum near the triple point temperature of hydrogen and a phase transition at T = 17.1 K. The detected features of C T sol ( ) indicate that the preparation of the solid Ne -n-H 2 from a gas phase leads to the formation of a nonequilibrium long-living phase Ne with large H 2 concentrations and a small portion of H 2 inclusions with low Ne concentrations. The phase transition is caused by decompositions of this phase. The phase dose not recover on cooling the sample after the phase transition. It is found that the rate of the ortho-para conversion of the H 2 molecules in the solid Ne -n-H 2 solutions higher than that of solid H 2 .

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“…2. It is seen that our results, the heat capacity of solid Ne [9] and the sum of p-H 2 (5.1%) and Ne (94.9%) differ less than by 7%.…”

Section: Resultscontrasting

confidence: 56%

The effect of n-H2 impurity on the heat capacity of solid Ne

Bagatskii

Minchina

Parbuzin

2009

Low Temperature Physics

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“…Table I also includes smoothed values of C v as calculated from the data of FS, 2 molar volumes from the x-ray data, 4 selected values of the adiabatic bulk modulus, and corresponding Grfineisen parameters calculated iteratively using Eqs. (1) and (2). The saturated vapor pressure values differ significantly from the P = 0 values only for the thermal expansion coefficient and hence for "~,.…”

Section: Discussionmentioning

confidence: 95%

“…(1) using the actual experimental ~'s (fl = 3~t) and smoothed values of Cv, V, and B s (see Table I) that correspond to the experimental temperatures. In this calculation, the relation Cp/Cv = Bs./Br = 1 4-flTT (2) also is required, since the basic data are B s and Cv. Figure 1 is, in effect, a plot of the deviations of the experimental values of the expansion coefficient from the smoothed relation.…”

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confidence: 99%

Experimental thermal expansions for solid neon, 2?14 K

Holste

1975

J Low Temp Phys

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Linear thermal expansion measurements are reported for free-standing samples of solid neon at temperatures from 2 to 14 K. After normalization, the results agree well with x-ray data in an overlap region between 8 and 14 K. The T = 0 Griineisen parameter 7'o = 2.58 (+_0.05) is in excellent agreement with the results obtained from high-pressure equation of state data. Smoothed thermodynamic functions for solid neon at saturated vapor pressure are tabulated, and inconsistencies in published high-temperature bulk modulus results are discussed,

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“…These parameters produce reasonable results for the cohesive energies and for the temperature dependence of the bulk modulus at zero pressure, but they do not give good agreement for the pressure dependence of the bulk modulus (19). An adequate two-body potential has not been found as yet for neon, but the recent work definitely has shown that the LJ 6-12 potential is not correct (16,19 (20,21) and constant volume (22,23), and several measurements…”

Section: Chapter I Introductionmentioning

confidence: 99%

Thermal expansion of solid neon from 1 to 15 K

Holste

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Specific heats of solid natural neon at five molar volumes and of the separated neon isotopes atP=0

Cited by 35 publications

References 23 publications

The effect of n-H2 impurity on the heat capacity of solid Ne

The effect of n-H2 impurity on the heat capacity of solid Ne

Experimental thermal expansions for solid neon, 2?14 K

Thermal expansion of solid neon from 1 to 15 K

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