Temperature dependence of the molar volumes of liquid and solid3He at melting pressure nearT N

1995 ◽  
Vol 100 (1-2) ◽  
pp. 167-171 ◽  
Author(s):  
W. Ni ◽  
J. S. Xia ◽  
E. D. Adams ◽  
Y. Takano
Keyword(s):  
Temperature Dependence ◽  
Molar Volumes ◽  
Melting Pressure

Voraussage der Temperaturabhängigkeit des Zusatzvolumens einfacher binärer nichtassoziierter Mischungen aus Reinstoffdaten / Predction of the Temperature Depedence of the Excess Volume of Simple Binary Nonassociated Mixtures from Data of the Pure Components

1978 ◽  
Vol 33 (2) ◽  
pp. 181-184
Author(s):  
Ernst Liebermann
Keyword(s):  
Temperature Dependence ◽  
Excess Volume ◽  
Empirical Parameter ◽  
Molar Volumes ◽  
Binary Liquid ◽  
Macroscopic Properties ◽  
Classical Thermodynamics

An equation relating the temperature dependence of the excess volume VE of simple binary liquid nonassociated mixtures to the molar volumes, the isobaric expansivities and the isothermal compressibilities of the pure solvents is proposed. The treatment is based on averaging over the macroscopic properties of the unmixed components on the grounds of classical thermodynamics. Predictions are made without using any empirical parameter.

Polymorphism in phenol under pressure: dielectric properties and molar polarizations of polycrystalline phenol I and II

1977 ◽  
Vol 55 (8) ◽  
pp. 1294-1302 ◽  
Author(s):  
John E. Bertie ◽  
Peter R. Tremaine
Keyword(s):  
Dielectric Properties ◽  
Temperature Dependence ◽  
Dielectric Relaxation ◽  
Applied Pressure ◽  
Thermal Expansivity ◽  
Hydrogen Atoms ◽  
Dielectric Parameters ◽  
Molar Volumes ◽  
Molar Polarization ◽  
Hydroxyl Hydrogen

The dielectric properties of phenol I have been measured as isothermal functions of pressure between 140 and 1520 bar and between +35 and −10 °C. No dielectric relaxation was observed. The static (50 kHz) permittivity at 10 °C is given with a precision of 0.3% by[Formula: see text]where P is in bar. The extrapolated value at 1 bar is 2.882 ± 0.009 which compares with literature values between 2.74 and 2.84. The 50 kHz molar polarization, [Formula: see text], at 10 °C is given by[Formula: see text]where V and Vo are the molar volumes at pressures P and 1 bar, respectively. At 10 °C and 1 bar, the electronic and atomic polarizations are estimated to be 26.9 ± 0.3 cm3 and 5.1 ± 0.4 cm3, respectively. Expressions for the isobaric temperature dependence of εo′ are reported for several pressures. Below 1500 bar, (∂εo′/∂T)P is negative, as expected from the density change but in contrast with previous results and with results obtained while varying the temperature under a constant applied pressure of 1 kbar. The accuracy of the temperature dependence at 1 bar is not high, judging from the thermal expansivity calculated from it.εo′ of phenol II at 10 °C and an estimated pressure of 2000 bar is 3.10 ± 0.06, with the corresponding molar polarization 30.75 ± 0.5 cm3. No intrinsic dielectric relaxation was observed in phenol II and the molar polarization shows no marked discontinuity at the transition. Phenol II is, therefore, like phenol I, a hydrogen-bonded solid in which the hydroxyl hydrogen atoms are ordered, either fully or in chains. The dielectric parameters and Arrhenius activation energies of two transient dispersions which appeared whenever phenol II formed are discussed.

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