Filters
Results 1 - 10 of 16
Results 1 - 10 of 16.
Search took: 0.026 seconds
| Sort by: date | relevance |
[en] The paper points out how the accumulated knowledge of glass corrosion and the latest understanding of the glassy state need to be merged in order to improve the predictive power of existing corrosion models. In specific, two areas are identified which require substantial improvement. These are, firstly, an adequate description of the effects of glass composition, and, secondly, an explicit formulation of the pH dependence of the forward reaction rate. The former problem is solved by employing a constitutional approach to the Gibbs energy of the glass. The latter problem is tackled by taking into account the occupation of the glass surface by charged species (H+, OH-, R+, etc.). (author)
Journal
[en] An evaluation of a broad set of HLW glass corrosion data implies that adequate corrosion models must also take into account kinetics slower than √t. Solubility limits may not give a sufficient explanation for these cases. Before all, the long-term leach rates are not infinitely small. A proposal is made how ''slow'' kinetics can be included in a model. 15 refs., 5 figs
Source
Jantzen, C.M.; Stone, J.A.; Ewing, R.C. (eds.); Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA); New Mexico Univ., Albuquerque (USA); p. 155-162; ISBN 0-931837-09-X; 
; 1984; p. 155-162; Materials Research Society; Pittsburgh, PA (USA); Materials Research Society annual meeting; Boston, MA (USA); 26-29 Nov 1984
; 1984; p. 155-162; Materials Research Society; Pittsburgh, PA (USA); Materials Research Society annual meeting; Boston, MA (USA); 26-29 Nov 1984
[en] We have investigated various aspects of the wetting behavior of hydrogen films (including the heavier isotopes) using surface plasmon resonance, light scattering, and photoelectron emission. Studies in the vicinity of the triple point (T3(H2)=13,96 K) confirmed the known << triple point wetting >>, and gave no indications for a prewetting transition in this range. At low temperatures (T< T3/3) the equilibrium film thickness reaches only a few monolayers. Thicker films, prepared by quench-condensation of H2 gas at 1.5 K, undergo a dewetting process during annealing: most of the film material contracts to clusters, and in between the films thins down to its equilibrium thickness. This surface diffusion process is thermally activated, with an activation energy of 23 K (in the case of H2). The dewetting kinetics has not revealed any indication for a surface-molten layer on the solid films at low temperatures, or for a superfluid component
Journal
[en] During the years 1975 to 1984, the Commission of the European Communities organized and promoted an R and D programme on the testing and evaluation of solidified high-level waste forms with the purpose of providing a scientific basis for the management and storage of radioactive waste. A fair number of materials were tested under a broad variation of experimental data. The Fraunhofer-Institut fuer Silicatforschung, Wuerzburg, has undertaken to perform a synoptic evaluation of the above data. The purpose of this evaluation is: - to compile the data from the individual national contributors (as presented in the joint annual reports of the EC) with respect to: the materials, or the experimental parameters, or further aspects, and to harmonize them with respect to their presentation, choice of units, etc., - to compare the results to the international state of information, - to elaborate and demonstrate common features of the diverse materials, e.g. common patterns of the corrosion behaviour, - to check the validity of present models, - to define shortcomings and questions that are still open
Source
1986; 223 p; ISBN 92-825-6560-2; ; CONTRACT 440-85-53-WAS-D
; CONTRACT 440-85-53-WAS-D
| 1 | 2 | Next |