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Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation

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Abstract

Multiphase nanopowders (NPs) and amorphous/amorphous-nanocrystalline coatings (A-NC) have been prepared by the evaporation of ceramic targets of Al2O3-Fe2O3 (0.1, 3, 5 Fe2O3 mass %) by a pulsed electron beam in vacuum. The specific surface area of NP Al2O3-Fe2O3 reached 277 m2/g. The α and γ phases Al2O3 and other nonidentified phases have been found in the composition of NP Al2O3-Fe2O3. All coatings contained an insignificant fraction of the crystalline γ phase. No secondary phases on the basis of iron have been revealed. According to transmission electron microscopy, the fine fraction of NP Al2O3-Fe2O3 consists of amorphous nanoparticles of an irregular and quasispherical shape no more than 10 nm in size which form agglomerates reaching 1.5 μm. A large fraction of NPs consists of crystal spherical nanoparticles with preferential sizes of about 10–20 nm. All NP Al2O3-Fe2O3 showed ferromagnetic behavior at room temperature. The maximum magnetic response has been established in NPs with a minimum iron content (1.1 mass %). The pulsed cathode luminescence spectra of coatings and NP Al2O3-Fe2O3 have been presented by a wide band in the wavelength range of 300–900 nm regardless of their phase composition. Phase transformations into NP AL2O3-1.1% Fe and coatings from undoped Al2O3 heated to 1400°C occur according to the following scheme: amorphous phase → γ → δ → θ → α, regardless of their initial phase composition. The threshold of thermal stability of the Γ phase in NPs and the coating of undoped Al2O3 does not exceed 830°C. For the first time, the increased thermo and optically stimulated luminescent response comparable with the response of the leading TLD-500K thermoluminescent dosimeter has been reached in A-NC coatings of undoped Al2O3.

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Authors and Affiliations

  1. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620016, Russia

    S. Yu. Sokovnin & V. G. Il’ves

  2. Ural Federal University, Yekaterinburg, 620002, Russia

    S. Yu. Sokovnin, A. I. Surdo & I. I. Mil’man

  3. Institute of Industrial Ecology, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620219, Russia

    A. I. Surdo & M. I. Vlasov

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  1. S. Yu. Sokovnin
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Original Russian Text © S.Yu. Sokovnin, V.G. Il’ves, A.I. Surdo, I.I. Mil’man, M.I. Vlasov, 2013, published in Rossiiskie Nanotekhnologii, 2013, Vol. 8, Nos. 7–8.

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Sokovnin, S.Y., Il’ves, V.G., Surdo, A.I. et al. Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation. Nanotechnol Russia 8, 466–481 (2013). https://doi.org/10.1134/S1995078013040186

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