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Titolo: Diffusion of hydrogen in selfstressed metals  transfer function spectroscopy approach
Autore: Zoltowski, P;
 Indirizzi:
 Polish Acad Sci, Inst Phys Chem, PL01224 Warsaw, Poland Polish Acad Sci Warsaw Poland PL01224 hys Chem, PL01224 Warsaw, Poland
 Titolo Testata:
 JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 12,
volume: 501,
anno: 2001,
pagine: 89  99
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 ACAV METHODS; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ENTRY SIDE IMPEDANCE; THEORETICALANALYSIS; PRESSURE MODULATION; ABSORPTION REACTION; BOUNDARYCONDITIONS; PD81PT19 MEMBRANE; PERMEATION; PALLADIUM;
 Keywords:
 hydrogen diffusion; stress; palladium and its alloys; transfer function spectroscopy; electrochemical impedance spectroscopy;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 49
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Zoltowski, P Polish Acad Sci, Inst Phys Chem, Kasprzaka 4452, PL01224 Warsaw, Poland Polish Acad Sci Kasprzaka 4452 Warsaw Poland PL01224 oland



 Citazione:
 P. Zoltowski, "Diffusion of hydrogen in selfstressed metals  transfer function spectroscopy approach", J ELEC CHEM, 501(12), 2001, pp. 8999
Abstract
The transfer function spectroscopy approach to the diffusion of hydrogen in a selfstressed isotropic elastic metal matrix is proposed. The system should be close to equilibrium. It is perturbed by a sinewave input signal applied at one surface of the thinplate specimen. The magnitude of this signal, of varied frequency, is small enough to treat the system as linear. The response signal is measured at the opposite surface of the specimen. The transfer function is the ratio of steadystate response to input signals. The hydrogen concentration and hydrogen flux are the input and output signals, respectively. The diffusion equations are derived, and they are served analytically. The resulting transfer function is discussed in terms of hydrogen permeation through a specimen of properties similar to palladium and Pd,,Pt,, alloy, in a wide range of hydrogen concentrations in the metal matrix. It is demonstrated that at relatively high frequencies the transfer function is highly sensitive to the nonFickian diffusion, resulting from the nonlocal effect of selfstress. In contrast, at infinitesimally low frequency, i.e. at steadystate, both local and nonlocal effects compensate. Hence, the selfstress is absent. Under the proposed experimental conditions the transfer function spectroscopy is more appropriate for studying the diffusion, of hydrogen in selfstressed metals than the commonly used transient breakthrough method. It should allow the study of the diffusion coefficient of hydrogen in metals, and, moreover, of the elastic modulus of metalhydrogen solids, both these quantities as function of hydrogen concentration in isotropic matrixes. (C) 2001 Elsevier Science B.V. All rights reserved.
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Documento generato il 05/04/20 alle ore 20:36:36