0000000000194790

AUTHOR

P. Moretti

showing 3 related works from this author

Ion implantation effects in BaTiO3 single crystals

1991

Abstract Thermally controlled helium implantation has been used to produce planar waveguides in BaTiO3 without noticeable depoling effects in the samples. Profiles for the ordinary and extraordinary refractive index are deduced from optical mode measurements. No annealing procedure is required. We report the effects of different ion fluences and energies in the MeV range on the waveguide properties.

Nuclear and High Energy PhysicsMaterials sciencebusiness.industryAnnealing (metallurgy)Physics::Opticschemistry.chemical_elementMolecular physicslaw.inventionIonOpticsIon implantationPlanarchemistrylawbusinessInstrumentationWaveguideRefractive indexHeliumNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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Proton implanted waveguides in LiNbO3, KNbO3and BaTiO3

1992

Abstract By using a Van De Graaf accelerator, planar waveguides in LiNbO3, KNbO3, and BaTiO3 are fabricated (at 300 K) by thermally controlled proton implantation. The waveguide properties are investigated by dark line mode spectroscopy. The reconstructed profiles closely follow the ion concentration profiles as determined by simulation (TRIM).

Materials scienceProtonbusiness.industryProton implantationPhysics::OpticsCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionIonCondensed Matter::Materials SciencePlanarOpticslawVan de Graaff generatorAtomic physicsDark lineSpectroscopybusinessWaveguideFerroelectrics
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Niobium implantation effects in BaTiO3 and SrTiO3

1992

Abstract Single crystals of BaTiO3 and SrTiO3 have been implanted at room temperature with 150 keV Nb+ ions to doses ranging from 1014 to 1017 ions cm2. The structure and the oxidation state of the damaged layer have been investigated by Rutherford backscattering-ion channeling and electron spectroscopy, respectively. SrTiO3 is rendered amorphous at relatively low doses of 2 × 1015 ions cm−2, but the damage is efficiently annealed at 450°C for 1 2 h. For both materials, the oxidation state of niobium varies from + 5 to + 2 along the depth. Moreover, a considerable chemical shift (2.3 eV) is observed for barium in BaTiO3.

Nuclear and High Energy PhysicsMaterials scienceLow doseAnalytical chemistryNiobiumchemistry.chemical_elementBariumElectron spectroscopyAmorphous solidIonCrystallographychemistryOxidation stateInstrumentationLayer (electronics)Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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