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7 papers · 2 filters
Si3N4 single-crystal nanowires grown from silicon micro and nanoparticles near the threshold of passive oxidation
J. Farjas, C. Rath, A. Pinyol +2
A simple and most promising oxide-assisted catalyst-free method is used to prepare silicon nitride nanowires that give rise to high yield in a short time. After a brief analysis of…
Kinetic study of the oxide-assisted catalyst-free synthesis of silicon nitride nanowires
J. Farjas, A. Pinyol, Chandana Rath +2
The synthesis of Si3N4 nanowires from the reaction of silicon nanoparticles with N2 in the 1200-1440 C temperature range is reported. The nitridation conditions are such that the r…
Surface anisotropy broadening of the energy barrier distribution in magnetic nanoparticles
Nicolas Perez, Pablo Guardia, Alejandro G. Roca +7
The effect of surface anisotropy on the distribution of energy barriers in magnetic fine particles of nanometer size is discussed within the framework of the scaling…
Combined experimental and theoretical investigation of the premartensitic transition in NiMnGa
C. P. Opeil, B. Mihaila, R. K. Schulze +8
Ultraviolet-photoemission (UPS) measurements and supporting specific-heat, thermal-expansion, resistivity and magnetic-moment measurements are reported for the magnetic shape-memor…
Dislocation interactions mediated by grain boundaries
Paolo Moretti, Lasse Laurson, Mikko J. Alava
The dynamics of dislocation assemblies in deforming crystals indicate the emergence of collective phenomena, intermittent fluctuations and strain avalanches. In polycrystalline mat…
Elastocaloric effect associated with the martensitic transition in shape-memory alloys
Erell Bonnot, Ricardo Romero, Lluis Manosa +2
The elastocaloric effect in the vicinity of the martensitic transition of a Cu-Zn-Al has been studied by inducing the transition by strain or stress measurements. While transition…