Electron-energy-loss spectroscopy has been used to identify microcrystalline diamond films produced by laser ablation of graphite. The production of the diamond phase results from varying the deposition geometry and parameters from those of an earlier configuration that produced diamondlike carbon films. A complete study of these crystalline and amorphous materials indicates a plasmon energy variation for films produced in different environments.Spectra taken with different primary energies show variation in the plasmon energy in hydrogenated carbon films. These changes were interpreted as a variation in the bonding nature of the sample with depth. The spectra of all samples were analyzed to determine sp /sp +sp fraction, dielectric functions, and optical band gap.
BaTiO 3 /SrTiO 3 multilayered thin films were deposited on Si and Pt/Si substrates. X-ray diffraction clearly shows the formation of the superstructures. Phase transition properties were studied via dielectric measurements. Glassy behavior, characterized by a strong frequency dispersion of dielectric properties, was found in samples with a total thickness of 400 nm, while in samples with a total thickness of 800 nm, normal ferroelectric phase transitions with two dielectric peaks were observed. A preliminary interpretation assumes that size effects which frustrate long range ferroelectric ordering may lead to the relaxational behavior in BaTiO3/SrTiO3 superstructures.
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