Allowing for Intermolecular Vibrations in the Thermodynamic Functions of a Liquid Inert Gas

2019 ◽  
Vol 93 (4) ◽  
pp. 603-613 ◽  
Author(s):  
Yu. K. Tovbin
Keyword(s):  
Thermodynamic Functions ◽  
Inert Gas ◽  
Intermolecular Vibrations

Thermodynamics of porphyrin sublimation

2000 ◽  
Vol 04 (08) ◽  
pp. 699-706 ◽  
Author(s):  
GERMAN L. PERLOVICH ◽  
OLEG A. GOLUBCHIKOV ◽  
MARIJA E. KLUEVA
Keyword(s):  
Crystal Structure ◽  
Vapor Pressure ◽  
Thermodynamic Functions ◽  
Gas Flow ◽  
Thermal Destruction ◽  
Saturated Vapor ◽  
Inert Gas ◽  
Sublimation Enthalpy ◽  
Vapor Pressures ◽  
Dsc Method

The saturated vapor pressures of tetraphenylporphyrin H 2 TPP , its four-coordinated metallo-complexes MTPP ( M ≡ Ni , Cu , Zn , Pd , Ag , Cd ) and some phenyl-substituted derivatives H 2 T ( R ) PP ( R ≡ 2-, 3-, 4- CH 3; 2-, 4- F ; 2-, 3-, 4- Cl ; 3-, 4- Br ; 3,5- C ( CH 3)3) have been measured using the inert gas flow method. The values of sublimation enthalpy Δ sub H m and entropy Δ sub S m are calculated. On the basis of the kinetic vapor pressure dependence, the start temperatures of thermal destruction of the investigated porphyrins are determined. The temperatures of melting of the tetraphenylporphyrin metallo-complexes measured by the DSC method are in linear correlation with the Δ sub H m values. The correlation between the thermodynamic functions of porphyrin sublimation (Δ sub H m , Δ sub S m , Δ sub G m ) and the literature data on the crystal structure of the compounds is considered. The Δ sub H m values obtained by some authors by different methods are compared with the results of our investigations. Possible reasons for discrepancies in the results are discussed.

Fission Gas Bubbles in Fractured UO2

1968 ◽  
Vol 26 ◽  
pp. 286-287
Author(s):  
O. M. Katz
Keyword(s):  
Electron Microscopy ◽  
Thermal Gradient ◽  
Gas Bubbles ◽  
Inert Gas ◽  
Thermal Gradients ◽  
Fission Gas ◽  
Beam Heating ◽  
Limited Application ◽  
Bubble Characteristics ◽  
Electron Beam Heating

The swelling of irradiated UO2 has been attributed to the migration and agglomeration of fission gas bubbles in a thermal gradient. High temperatures and thermal gradients obtained by electron beam heating simulate reactor behavior and lead to the postulation of swelling mechanisms. Although electron microscopy studies have been reported on UO2, two experimental procedures have limited application of the results: irradiation was achieved either with a stream of inert gas ions without fission or at depletions less than 2 x 1020 fissions/cm3 (∼3/4 at % burnup). This study was not limited either of these conditions and reports on the bubble characteristics observed by transmission and fractographic electron microscopy in high density (96% theoretical) UO2 irradiated between 3.5 and 31.3 x 1020 fissions/cm3 at temperatures below l600°F. Preliminary results from replicas of the as-polished and etched surfaces of these samples were published.

Inert-gas crystals with imbedded impurities

1978 ◽  
Vol 125 (6) ◽  
pp. 331-349 ◽  
Author(s):  
Boris M. Smirnov
Keyword(s):  
Inert Gas
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