Zobrazeno 1 - 10
of 257
pro vyhledávání: '"G. Cannelli"'
Autor:
B. Molinas, Pasquale Rispoli, P.P. Zonta, G. Cannelli, Oriele Palumbo, Annalisa Paolone, Srdjan Nesic, Rosario Cantelli
Publikováno v:
Materials Science and Engineering: A. :343-346
In the present work we report an anelastic spectroscopy study of pure FeCO 3 (siderite) and of carbon steel samples covered by siderite films. Uncovered steel samples have also been investigated for reference. The siderite shows two relaxation proces
Autor:
A. Gallitognotta, Francesco Trequattrini, Rosario Cantelli, G. Cannelli, A. Coda, Francesco Cordero
Publikováno v:
Journal of Alloys and Compounds. 438:190-194
A detailed study of the relaxation process occurring in polycrystalline ZrV 2 H x (0 ≤ x ≤ 1) below room temperature has been carried out by means of acoustic spectroscopy. At low H concentrations the main effect is due to the well known martensi
Publikováno v:
Journal of Alloys and Compounds. 310:196-199
Acoustic spectroscopy and electrical resistivity measurements have been employed to investigate the two relaxation processes occurring at liquid He temperature in very dilute Y–H and Sc–H alloys, and ascribed to H tunnelling systems near single o
Autor:
Francesco Trequattrini, Francesco Cordero, G. M. Guadalupi, G. Cannelli, Oriele Palumbo, Rosario Cantelli, B. Molinas
Publikováno v:
Journal of Alloys and Compounds. 310:288-291
The elastic energy loss of InP has been measured between 1.9 and 450 K in the frequency range 1 to 16 kHz. In the InP samples displaying the semi-insulating state, obtained either by thermally treating at 950°C the undoped material or by doping with
Autor:
B. Molinas, Rosario Cantelli, Francesco Trequattrini, Francesco Cordero, G. Cannelli, G. M. Guadalupi, Oriele Palumbo
Publikováno v:
Scopus-Elsevier
Venezia Tecnologie SpA (ENI Group), Via delle Industrie 39, I-30175 P. Marghera (VE), Italy~Received 2 December 1999!Elastic energy absorption measurements versus temperature on semiconducting, semi-insulating~SI!, andFe-doped InP are reported. A the
Publikováno v:
Journal of Alloys and Compounds. :396-399
The motion regimes of hydrogen and deuterium in p -type Si:B and GaAs:Zn have been studied by anelastic spectroscopy (elastic energy loss and dynamic modulus) between 1 and 600 K in the frequency range (1–40) kHz. Interstitial H or D in Si:B are bo
Publikováno v:
Journal of Alloys and Compounds. :334-337
Acoustic spectroscopy has been employed to investigate the nature of the processes occurring at liquid He temperature in pure polycrystalline Y and Sc for frequencies in the kHz range. The anelastic spectra indicate that hydrogen is delocalized in at
Autor:
Francesco Trequattrini, G. Cannelli, Rosario Cantelli, Maurizio Ferretti, Carlos Roberto Grandini, Francesco Cordero
Publikováno v:
Physical Review B. 57:8580-8589
CNR Area di Ricerca di Tor Vergata Istituto di Acustica O.M. Corbino, Via del Fosso del Cavaliere, I-00133 Roma
Publikováno v:
Scopus-Elsevier
In the oxide superconductors with the 123 and 214 structure several anelastic relaxation processes are observed with activation energies below 0.2 eV, but there is no general agreement on their mechanisms. One of these processes, occurring in semicon
Publikováno v:
Scopus-Elsevier
The nature of the numerous thermally activated processes occurring in yttrium has been investigated by acoustic spectroscopy in polycrystalline samples. The measurements have been carried out between 1.1 and 600 K in the kHz range, varying the concen