Thermodynamic Properties of Thorium Tetrafluoride from 5 to 300°K. and the Magnetic Entropy of Uranium Tetrafluoride

1954 ◽  
Vol 76 (14) ◽  
pp. 3837-3839 ◽  
Author(s):  
Harold R. Lohr ◽  
Darrell W. Osborne ◽  
Edgar F. Westrum
Keyword(s):  
Thermodynamic Properties ◽  
Magnetic Entropy ◽  
Uranium Tetrafluoride ◽  
Thorium Tetrafluoride

A Statistical Mechanical Equation of State for Fluid UF4 and ThF4

2010 ◽  
Author(s):  
Shisheng Wang ◽  
Werner Maschek
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Correction Term ◽  
Liquid Density ◽  
Perturbation Scheme ◽  
Mechanical Perturbation ◽  
Uranium Tetrafluoride ◽  
Molecular Fluids ◽  
Statistical Mechanical ◽  
Thorium Tetrafluoride

The Song, Mason and Ihm [1–4] equation of state with modification of Tao and Mason [5], originally derived for spherical and molecular fluids, is applied for fluid uranium tetrafluoride and thorium tetrafluoride based on the available experimental data. The equation of state based on statistical mechanical perturbation theory with the perturbation scheme of Weeks, Chandler, and Andresen [6]. The prediction of constants applied in the equation of state is based on the work of Boushehri et al. [7–8] using heat of vaporization and liquid density at the triple point. The vapor correction term bases on the experimental data. The results show that this equation of state agrees reasonably well with the available experimental data.

Thermodynamic Properties of RZnSn2 (R = Y, Er, Lu) Compounds with HfCuSi2 Structure Type

2012 ◽  
Vol 194 ◽  
pp. 67-70 ◽  
Author(s):  
Kazimierz Łątka ◽  
Janusz Przewoźnik ◽  
Yury Verbovytskyy ◽  
Antonio Pereira Gonçalves
Keyword(s):  
Thermodynamic Properties ◽  
Specific Heat ◽  
Ground State ◽  
Magnetic Ordering ◽  
Structure Type ◽  
Sharp Peak ◽  
Magnetic Entropy

The results of magnetic and specific heat studies are reviewed and discussed for the series of RZnSn2 (R = Y, Er and Lu) compounds crystallizing in the same tetragonal HfCuSi2 - type of structure. A sharp peak in the specific heat of ErZnSn2 compound is indicative for magnetic ordering of Er moments at 5.0 K, being in agreement with its established antiferromagnetic nature. The estimated magnetic entropy Smagn contribution is less than that expected for the ground state J = 15/2 multiplet of Er3+.

Thermodynamic properties of CoCr2O4: specific heat and magnetic entropy

2013 ◽  
Vol 40 (3) ◽  
pp. 203-206 ◽  
Author(s):  
M. Uhlarz ◽  
A. V. Pronin ◽  
J. Wosnitza ◽  
A. S. Prokhorov ◽  
A. A. Bush
Keyword(s):  
Thermodynamic Properties ◽  
Specific Heat ◽  
Magnetic Entropy

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

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