scholarly journals Torsion Effusion Study of the Vapor Pressure and Heat of Sublimation of Gallium

1964 ◽  
Vol 111 (10) ◽  
pp. 1170 ◽  
Author(s):  
Zuhair A. Munir ◽  
Alan W. Searcy
Keyword(s):  
Vapor Pressure ◽  
Torsion Effusion

Vapor Pressure of Antimony by the Torsion‐Effusion Method

1961 ◽  
Vol 35 (3) ◽  
pp. 788-794 ◽  
Author(s):  
Gerd M. Rosenblatt ◽  
C. Ernest Birchenall
Keyword(s):  
Vapor Pressure ◽  
Effusion Method ◽  
Torsion Effusion

Torsion effusion vapor pressure determinations of Os, Rh, Ru, W, Co, and Cr solid carbonyls

2005 ◽  
Vol 66 (2-4) ◽  
pp. 241-245 ◽  
Author(s):  
Dhanesh Chandra ◽  
K.H. Lau ◽  
Wen-Ming Chien ◽  
Michael Garner
Keyword(s):  
Vapor Pressure ◽  
Torsion Effusion

Decomposition pressures and enthalpies of formation of some transition metal diarsenides and diselenides

1967 ◽  
Vol 45 (22) ◽  
pp. 2675-2687 ◽  
Author(s):  
J. J. Murray ◽  
R. D. Heyding
Keyword(s):  
Vapor Pressure ◽  
Time Dependent ◽  
Heats Of Formation ◽  
Enthalpies Of Formation ◽  
Pressure Data ◽  
Kcal Mole ◽  
Orifice Area ◽  
Effusion Method ◽  
Decomposition Pressure ◽  
Torsion Effusion

The phase relations for the systems Pt/As, Os/As, Os/Se, and Ru/Se have been examined in the range 850–1 250 °K. Using the torsion effusion method, the decomposition pressures of PtAs2, OsAs2, OsSe2, and RuSe2 have been measured as a function of temperature. The apparatus and procedures were verified by measuring the vapor pressure of liquid silver. Equilibrium pressures were obtained for PtAs2 and RuSe2. OsAs2 exhibited an orifice area dependent nonequilibrium behavior and OsSe2 exhibited a time dependent nonequilibrium behavior. Equilibrium pressures were estimated in these latter two cases. Total equilibrium decomposition pressures (Pt), i.e. the pressure of arsenic or selenium vapors in equilibrium with each phase, are best described by the equations: [Formula: see text]Literature data on the equilibria between the various molecular species in selenium and arsenic vapor indicate that at these pressures and temperatures the vapor in equilibrium with the selenides is essentially pure Se2, but the vapor over the arsenides is a mixture of As2 and As4.The heats and entropies of decomposition of PtAs2, OsAs2, OsSe2, and RuSe2 have been calculated from the decomposition pressure data. The standard heats of formation at 298 °K are −42.0 ± 3.5, −18.5 ± 2.0, −32.5 ± 5.0, and −42.9 ± 3.5 kcal/mole, respectively. Heats of formation of MnSe2, CoSe2, NiSe2, and RhSe2 have been estimated using the heats of formation of OsSe2 and RuSe2, the Born–Mayer equation, and the Born–Haber cycle. These are −96 ± 8, −70 ± 8, −41 ± 8, and −12 ± 12 kcal/mole, respectively.

Vapor pressure measurements of Mg(BH4)2 using Knudsen torsion effusion thermo graphic method

2014 ◽  
Vol 39 (5) ◽  
pp. 2175-2186 ◽  
Author(s):  
L.-N.N. Nforbi ◽  
A. Talekar ◽  
K.H. Lau ◽  
R. Chellapa ◽  
W.-M. Chien ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Graphic Method ◽  
Pressure Measurements ◽  
Vapor Pressure Measurements ◽  
Torsion Effusion

Benzylamine Tartrate as an Organic Glass Substrate for Carbon Films by Evaporation

1970 ◽  
Vol 28 ◽  
pp. 484-485
Author(s):  
A. C. Faberge
Keyword(s):  
Vapor Pressure ◽  
Viscous Liquid ◽  
Glass Substrate ◽  
Room Temperature ◽  
Carbon Film ◽  
Carbon Films ◽  
Organic Glass ◽  
Spectroscopic Examination ◽  
Polymeric Substrates

Benzylamine tartrate (m.p. 63°C) seems to be a better and more convenient substrate for making carbon films than any of those previously proposed. Using it in the manner described, it is easy consistently to make batches of specimen grids as open as 200 mesh with no broken squares, and without individual handling of the grids. Benzylamine tartrate (hereafter called B.T.) is a viscous liquid when molten, which sets to a glass. Unlike polymeric substrates it does not swell before dissolving; such swelling of the substrate seems to be a principal cause of breakage of carbon film. Mass spectroscopic examination indicates a vapor pressure less than 10−9 Torr at room temperature.

Hydration Chamber for Jeolco 200 Kv Microscope

1970 ◽  
Vol 28 ◽  
pp. 542-543
Author(s):  
V. R. Matricardi ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Electron Microscope ◽  
Water Vapor ◽  
Vapor Pressure ◽  
Pressure Gradient ◽  
Room Temperature ◽  
List Type ◽  
Type Number ◽  
Equilibrium Vapor Pressure

In order to observe room temperature hydrated specimens in an electron microscope, the following conditions should be satisfied: The specimen should be surrounded by water vapor as close as possible to the equilibrium vapor pressure corresponding to the temperature of the specimen.The specimen grid should be inserted, focused and photo graphed in the shortest possible time in order to minimize dehydration.The full area of the specimen grid should be visible in order to minimize the number of changes of specimen required.There should be no pressure gradient across the grid so that specimens can be straddled across holes.Leakage of water vapor to the column should be minimized.

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