scholarly journals HIGH-TEMPERATURE FREE ENERGY, ENTROPY, ENTHALPY AND HEAT CAPACITY OF THORIUM SULFATE1

1960 ◽  
Vol 64 (7) ◽  
pp. 911-914 ◽  
Author(s):  
S. W. Mayer ◽  
B. B. Owens ◽  
T. H. Rutherford ◽  
R. B. Serrins
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
High Temperature ◽  
Energy Entropy

Enthalpy, free energy, entropy and heat capacity of cyclohexane and acetaldehyde

2010 ◽  
Vol 75 (9-10) ◽  
pp. 655-667 ◽  
Author(s):  
E. R. Lippincott ◽  
G. Nagarajan ◽  
J. E. Katon
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Energy Entropy

Statistical Thermodynamics Enthalpy, Free Energy, Entropy, and Heat Capacity of Some Hexafluorides of Octahedral Symmetry

1971 ◽  
Vol 26 (10) ◽  
pp. 1658-1666 ◽  
Author(s):  
G. Nagarajan ◽  
Donald C. Brinkley
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Infrared Absorption ◽  
Infrared Absorption Spectrum ◽  
Point Group ◽  
Structural Data ◽  
Octahedral Symmetry ◽  
Symmetry Point Group ◽  
Rigid Rotator ◽  
Energy Entropy

Abstract A detailed analysis of the molecular structural data and infrared absorption and Raman spectra of the hexafluoride of sulfur, selenium, tellurium, molybdenum, technetium, ruthium, rhodium, tungsten, thenium, osmium, iridium, platinum, uranium, neptunium, and plutonium has been made. These molecules, having the greatest number of symmetry elements of all existing molecules, possess an octahedral symmetry with the symmetry point group Oh. They give rise to six fundamental frequencies of which three are allowed in the Raman spectrum, two are allowed in the infrared absorption spectrum, and one is inactive. The inactive mode in normally determined from the overtones and combinations. On the basis of a rigid rotator and harmonic oscillator model, enthalpy, free energy, entropy, and heat capacity for temperatures from 200 °K to 2000 °K have been computed for these molecules. The results are briefly discussed and compared with available experimental data.

ABOUT HEAT CAPACITY OF TITANIUM CARBIDE TiCx

2019 ◽  
pp. 56-66
Author(s):  
I. Khidirov ◽  
V. V. Getmanskiy ◽  
A. S. Parpiev ◽  
Sh. A. Makhmudov
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Titanium Carbide ◽  
Temperature Dependence ◽  
Carbon Concentration ◽  
Room Temperature ◽  
Thermodynamic Characteristics ◽  
Liquid Nitrogen Temperature ◽  
Analysis Data ◽  
Thermal Excitation

This work relates to the field of thermophysical parameters of refractory interstitial alloys. The isochoric heat capacity of cubic titanium carbide TiCx has been calculated within the Debye approximation in the carbon concentration  range x = 0.70–0.97 at room temperature (300 K) and at liquid nitrogen temperature (80 K) through the Debye temperature established on the basis of neutron diffraction analysis data. It has been found out that at room temperature with decrease of carbon concentration the heat capacity significantly increases from 29.40 J/mol·K to 34.20 J/mol·K, and at T = 80 K – from 3.08 J/mol·K to 8.20 J/mol·K. The work analyzes the literature data and gives the results of the evaluation of the high-temperature dependence of the heat capacity СV of the cubic titanium carbide TiC0.97 based on the data of neutron structural analysis. It has been proposed to amend in the Neumann–Kopp formula to describe the high-temperature dependence of the titanium carbide heat capacity. After the amendment, the Neumann–Kopp formula describes the results of well-known experiments on the high-temperature dependence of the heat capacity of the titanium carbide TiCx. The proposed formula takes into account the degree of thermal excitation (a quantized number) that increases in steps with increasing temperature.The results allow us to predict the thermodynamic characteristics of titanium carbide in the temperature range of 300–3000 K and can be useful for materials scientists.

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