Search results for "Yttrium aluminium"

showing 2 items of 12 documents

Optical Properties of Natural and Synthetic Minerals

2015

The results of investigation of optical absorption and photoluminescence (PL) of topaz, beryl and yttrium aluminium garnet crystals doped with different concentrations of transition ions exposed to fast neutron irradiation and electron irradiation are presented. We suppose that irradiation leads to the formation of two types of complex centers: "Me2+-F+ (or F) centre" and complex centers, which consist of a cation vacancy and an impurity (iron, manganese and chromium) ion. Exchange interaction between radiation defects and impurity ions during neutron or electron irradiation gives rise to appearance of additional absorption and luminescence band broadening in investigated crystals.

inorganic chemicalsMaterials sciencePhotoluminescenceAbsorption spectroscopyAnalytical chemistrytechnology industry and agriculturechemistry.chemical_compoundCondensed Matter::Materials SciencechemistryYttrium aluminium garnetImpurityVacancy defectElectron beam processingPhysics::Atomic and Molecular ClustersIrradiationAbsorption (chemistry)inorganic compounds; absorption spectra; photoluminescence; neutron irradiationNuclear chemistryEnvironment. Technology. Resources.
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Luminescence properties of neodymium-doped yttrium aluminium garnet obtained by the co-precipitation method combined with the mechanical process

2005

Nanopowders of yttrium aluminium garnet Y3Al5O12 (YAG) doped with neodymium ions were obtained by the co-precipitation method from the reaction of aluminium and yttrium nitrate and neodymium oxide with ammonia. After washing and drying the hydroxide precursors were calcined at 500, 700, 800 and 900 °C for 1 hour and at 1000 °C for 3 hours. This product was treated by ball milling in a zirconia vial for 0.5, 1.5 and 10 h in order to achieve smaller nanoparticles. The structure, microstructure, morphology and optical properties were investigated by means of diffractometric, microscopic and spectroscopic techniques. The course of the amorphous-to-crystalline transformation was complete after c…

nanoparticles; coprecipitation; ball millingMaterials scienceMetallurgychemistry.chemical_elementcoprecipitationYttriumCondensed Matter PhysicsMicrostructureNeodymiumAtomic and Molecular Physics and Opticschemistry.chemical_compoundchemistryAluminiumYttrium aluminium garnetGeneral Materials ScienceCubic zirconiananoparticlesball millingLuminescenceBall millNuclear chemistry
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