The Kinetics of the Photoinitiated Reaction between Triethyl Phosphite and 1-Pentanethiol

1966 ◽  
Vol 70 (3) ◽  
pp. 605-610 ◽  
Author(s):  
R. D. Burkhart
Keyword(s):  
Triethyl Phosphite ◽  
Kinetics Of

Kinetics of reactions of undecacarbonyl(triethyl phosphite)triruthenium with some P- and As-donor ligands

1989 ◽  
Vol 67 (11) ◽  
pp. 1924-1930 ◽  
Author(s):  
Lezhan Chen ◽  
Anthony J. Poë
Keyword(s):  
Rate Equation ◽  
Activation Parameters ◽  
Triethyl Phosphite ◽  
Nucleophilic Attack ◽  
Donor Ligands ◽  
Metal Carbonyls ◽  
Kinetic Characteristics ◽  
Ruthenium Clusters ◽  
Kinetics Of

The kinetics have been studied of reactions of the cluster Ru3(CO)11 (P(OEt)3) with a variety of P- and As-donor nucleophiles, L, in alkane solution. Reactions proceed according to the rate equation: kobsd = k1 + k2 [L] and activation parameters for the two paths have been obtained. When combined with activation parameters for Ru3(CO)12 and some other Ru3(CO)11L′ clusters the values of [Formula: see text] and [Formula: see text] are found to lie on a good isokinetic plot. The changes in the activation parameters are consistent with major and systematic changes in the nature of the Ru3(CO)10L′ moieties left after CO dissociation.Analysis of the dependence of log k2 on the electronic and steric nature of the various nucleophiles leads to the derivation of electronic and steric profiles that are characteristic of the cluster, together with values for the intrinsic or standard susceptibility of the cluster towards nucleophilic attack. These kinetic characteristics are compared with those similarly derived for Ru3(CO)12. Keywords: metal carbonyls, ruthenium, clusters, kinetics, mechanisms.

Reaction kinetics of triethyl phosphite with p-phenacylchlorides

1971 ◽  
Vol 12 (36) ◽  
pp. 3347-3350 ◽  
Author(s):  
A. Arcoria ◽  
S. Fisichella
Keyword(s):  
Reaction Kinetics ◽  
Triethyl Phosphite ◽  
Kinetics Of

Kinetics of the interaction of phenolic Mannich bases with triethyl phosphite

1971 ◽  
Vol 20 (10) ◽  
pp. 2068-2070
Author(s):  
B. E. Ivanov ◽  
L. A. Valitova ◽  
L. A. Khismatullina ◽  
M. Sh. Yagfarov
Keyword(s):  
Triethyl Phosphite ◽  
Mannich Bases ◽  
Kinetics Of

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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