It is found that GASH single crystals consist of a volume with ferroelectric domain structure and of a “hexagonal domain” usually observed in the central part of samples cleaved perpendicularly to the polar axis. Results are given of scanning electron microscope and electron microscope decoration technique studies of the arrangement of the “hexagonal domain” and of the ferro‐electric domain structure within the bulk of GASH single crystals.
Structure and properties of W O 3 -doped Pb 0.97 La 0.03 ( Zr 0.52 Ti 0.48 ) O 3 ferroelectric thin films prepared by a sol-gel process J. Appl. Phys. 98, 034104 (2005); 10.1063/1.1999834Structural and optical properties of molybdenum-tungsten mixed oxide thin films deposited by the sol-gel technique Abstract. Cobalt doped TiO2 thin films (Co: TiO2, Co: 0-2-4-6 at. %) have been prepared by sol-gel method onto glass substrate at room temperature. The obtained films have been annealed at 500°C for 2 hours. X-ray diffraction patterns showed that all Al: TiO2 films are polycrystalline with a tetragonal anatase and orthorhombic brookite types structures. The surface morphologies of the TiO2 doped with cobalt thin films were evaluated by atomic force microscopy (AFM). The calculated optical band gap decreases from 3.03 to 2.96 eV with increasing Co doping.
Abstract. In this work we intend to study the pinned vortex fraction in type II superconductors. The sample used is the YBa2Cu3O7-γ . In continuation one will study the variations of this fraction according to the transport current density for two values of magnetic field (H = 0.6 T and H = 1.2 T) , and different values of temperature. The studied sample is a monocristalline YBaCuO thin film deposited by the ablation laser method on the surface (001) of a SrTiO3 substrate. In zero magnetic field, the resistance vanished a Tc = 90 K. The C-axis of YBaCuO is perpendicular to surface of the film. Electrodes of measurement are in gold and deposited on the surface of the sample in situ by evaporation. The film has a thickness of 400 nm, and a width 7.53 µm. The distance between electrodes of power measurement is 135 µm. Contact resistances were less than 1 .
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