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The aim of this research was to investigate the thermal stability of an ultrafine grained metastable β Ti alloy, Ti–25Nb–3Zr–3Mo–2Sn, which was formed using a modified accumulative roll bonding technique. The thermal stability was assessed during annealing heat treatments through property and microstructure observations. Only small changes were detected in the hardness during annealing at temperatures...
Silicon rich oxide has shown photoemission. However, normally it is required a high temperature annealing in order to get intense emission. On the other hand, Si nanocrystals, nC, obtained by electrochemical methods and poured in a solutions have shown photoemission that depends on their size. Then, Si nC obtained by electrochemical methods are an alternative to obtain emissive silicon rich oxide...
Photoluminescence and Cathodoluminescence of hydrogenated Silicon Rich Oxide (SRO:H) films were studied. The samples were prepared by Low Pressure Chemical Vapor Deposition (LPCVD) on Si substrates, some samples were thermally annealed at high temperature and hydrogenation was made by low temperature annealing in forming gas. Strong red PL (Photoluminescence) and CL (Cathodoluminescence) in almost...
Cathodoluminescence (CL) spectra for Silicon Rich Oxide (SRO) films with different silicon excess and nitrogen content are measured at room temperature. The SRO was deposited by Low Pressure Chemical Vapor Deposition (LPCVD) on Si substrates, and nitrogen was introduced into SRO adding NH3 to the reactive gases. The samples were divided in two parts, one part was annealed at 1100degC. The nitrogen...
Si nanocrystals are promising materials which can be used for optical sensor, memory devices and future optoelectronics devices. In this work we study the morphology surface and interface of the silicon rich oxide (SRO) films with different nanocrystals (nc-Si) embedded in a thin SiO2 matrix (Silicon excess). Also the surface roughness after annealing was investigated by means of Atomic Force Microscopy...
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