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Hidalgo Alcalde, Pedro ; Cepeda Jiménez, C. M. ; Ruano, O. A. ; Carreño, F. | Trans Tech Publications Ltd | 2010The 7075 Al alloy was processed by accumulative roll bonding (ARB) at 300, 350 and 400 ºC. The microstructure and texture were characterized and the hardness was measured. Cell/(sub)grain sizes less than 500 nm and typical beta-fibre rolling tex[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Montone, A. ; Piqueras de Noriega, Javier ; Cardellini, F. | Trans Tech Publications Ltd | 2000Mechanical milling is a technique extensively used to prepare nanocrystalline metallic materials but it has been less frequently applied to semiconductors. The preparation of nanocrystalline silicon by different methods is a subject of increasin[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Trans Tech Publications Ltd | 2008Sintering of a ZnO-MgO powder mixture under argon flow leads to the growth of elongated Mg doped ZnO structures such as stacks of nanoplates and rods with secondary nanowires in a comb-like arrangement. The nanoplates grow perpendicular to a cen[...]texto impreso
This paper describes the "pairing - dissociation" behaviour of metal-acceptor pairs and proposes a method to measure metal concentrations in p-type boron doped silicon based on a contactless measurement technique. The first part of this paper su[...]texto impreso
Ottaviani, L. ; Yakimov, E. ; Hidalgo Alcalde, Pedro ; Martinuzzi, S. | Trans Tech Publications Ltd | 2004Hydrogen is known to passivate donor and acceptor levels in SiC bulk, and also at the surface by forming bonds with Si atoms. Introduction of H atoms can then improve the electrical performance of Schottky diodes by reducing the metal-SiC interf[...]texto impreso
Cavallini, A. ; Dupasquier, A. ; Ferro, G. ; Piqueras de Noriega, Javier ; Valli, M. | Trans Tech Publications Ltd | 1997The radial vacancy distribution along a LEC-GaAs:Te wafer with an average free carrier concentration n = 1.5 x 10(18) cm(-3) was studied by means of positron lifetime spectroscopy. An M-shaped radial distribution of vacancy-like defects, most pr[...]
