http://www.cnr.it/ontology/cnr/individuo/prodotto/ID22068
Hydrogen-storage capacities and H diffusion in bcc TiVCr alloys (Articolo in rivista)
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- Hydrogen-storage capacities and H diffusion in bcc TiVCr alloys (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
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- Mazzolai G.; Coluzzi B.; Biscarini A.; Tuissi A.; Agresti F.; Lo Russo S.; Maddalena A.; Palade P.; Principi G (literal)
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- ISI Web of Science (WOS) (literal)
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- Università di Perugia, Dipartimento di Fisica, Via A. Pascoli 5, 06123 Perugia, Italy
Istituto per l'Energia e le Interfasi, CNR-IENI, C.so Promessi Sposi, 29, 23900 Lecco, Italy
Università di Padova, Dipartimento di Ingegneria Meccanica, Settore Materiali and CNISM, via Marzolo 9, 35131 Padova, Italy
Universit`a di Padova, Dipartimento di Fisica and CNISM, via Marzolo 8, 35131 Padova, Italy (literal)
- Titolo
- Hydrogen-storage capacities and H diffusion in bcc TiVCr alloys (literal)
- Abstract
- The H mass density of the bcc Ti35Cr65-xVx alloys (x = 18, 22) has been investigated as a function of pressure at various temperatures by
tracing P-C isotherms from which the formation enthalpy of the ? hydride has been derived (?H=-39±2 kJ/mol for the Ti35Cr43V22 alloy and
?H=-35±6 kJ/mol for the Ti35Cr47V18 alloy). Internal friction measurements have revealed the existence of a broad H Snoek-type of relaxation
at around 150K (f~=
1 kHz), which has been used to deduce information on H mobility. Combined Snoek and high-temperature absorption data
have provided the following values for the H diffusion parameters W and D0: W= 0.32±0.01 eV; D0 = (4±2)×10-7 m2/s (Ti35Cr47V18 alloy)
and W= 0.34±0.01 eV; D0 = (2±0.5)×10-7 m2/s (Ti35Cr43V22 alloy). X-ray diffraction patterns have confirmed the fcc lattice structure of the
hydride while differential scanning calorimetry and thermal desorption spectroscopy data exhibited peaks along the temperature scale which could
be attributed to structural transitions of the hydrides. The occurrence of these transitions is accounted for in terms of a previously proposed atomistic
model. (literal)
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