5 research outputs found

    Magnetic Anisotropy of Ultra-small Nanocrystals of CoFe2O4

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    Ferrimagnetic nanoparticles of CoFe2O4 with dimensions of 4-16 nm were synthesized by pyrolysis of a mixture of acetylacetonates of iron and cobalt. In the temperature range 300-500 K investigated field dependence of magnetization up o 18 kOe. Found a significant contribution of "surface" anisotropy to the effective anisotropy of the nanoparticles. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3536

    The synthesis of TiAlN composites by condensation of the different arc plasma flows

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    Some properties of the arc-vapour deposited TiAlN films, obtained both – by condensation of the different and combined titanium and aluminium plasma flows, have been investigated. The different flows was provided by two arc evaporators with titanium and aluminium cathodes, at that, the aluminium plasma was passed through the curvilinear plasma filter. The combined titanium-aluminium plasma was generated by single evaporator with the alloyed TiAl cathodes, which have a volumetric content of aluminium 50 %. The growth rates, surface morphology and the Vickers hardness of the TiAlN films, obtained under the various conditions, have been analyzed. The comparative cutting tool trials with the cemented carbide drills, covered by TiN, TiCN and TiAlN were conducted. It is shown, that the TiAlN film compositions, condensed from different plasma flows with the filtering aluminium plasma, are more profitable and has much higher characteristics, than films, obtained from alloyed TiAl cathodes.ДослідТСно властивості ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚Ρ–Π² TiAlN ΠΎΠ΄Π΅Ρ€ΠΆΠ°Π½ΠΈΡ… Ρ–Π· ΠΎΠΊΡ€Π΅ΠΌΠΈΡ… Ρ– сполучСних ΠΏΠΎΡ‚ΠΎΠΊΡ–Π² Ρ‚ΠΈΡ‚Π°Π½ΠΎΠ²ΠΎΡ— Ρ‚Π° Π°Π»ΡŽΠΌΡ–Π½Ρ–Ρ”Π²ΠΎΡ— ΠΏΠ»Π°Π·ΠΌΠΈ. ГСнСрування ΠΎΠΊΡ€Π΅ΠΌΠΈΡ… ΠΏΠΎΡ‚ΠΎΠΊΡ–Π² забСзпСчувалося Π΄Π²ΠΎΠΌΠ° Π²Π°ΠΊΡƒΡƒΠΌΠ½ΠΎ-Π΄ΡƒΠ³ΠΎΠ²ΠΈΠΌΠΈ Π²ΠΈΠΏΠ°Ρ€ΠΎΠ²ΡƒΠ²Π°Ρ‡Π°ΠΌΠΈ Π· Ρ‚ΠΈΡ‚Π°Π½ΠΎΠ²ΠΈΠΌ Ρ– Π°Π»ΡŽΠΌΡ–Π½Ρ–Ρ”Π²ΠΈΠΌ ΠΊΠ°Ρ‚ΠΎΠ΄Π°ΠΌΠΈ, ΠΏΡ€ΠΈΡ‡ΠΎΠΌΡƒ, Π°Π»ΡŽΠΌΡ–Π½Ρ–Ρ”Π²Π° ΠΏΠ»Π°Π·ΠΌΠ° ΠΏΡ€ΠΎΡ…ΠΎΠ΄ΠΈΠ»Π° Ρ‡Π΅Ρ€Π΅Π· ΠΊΡ€ΠΈΠ²ΠΎΠ»Ρ–Π½Ρ–ΠΉΠ½ΠΈΠΉ ΠΏΠ»Π°Π·ΠΌΠΎΠ²ΠΈΠΉ Ρ„Ρ–Π»ΡŒΡ‚Ρ€, Π΄Π΅ очищалася Π²Ρ–Π΄ ΠΏΠ°Ρ€iΠ² Ρ– макрочасток. Π‘ΠΏΠΎΠ»ΡƒΡ‡Π΅Π½ΠΈΠΉ ΠΏΠΎΡ‚Ρ–ΠΊ Ρ‚ΠΈΡ‚Π°Π½-Π°Π»ΡŽΠΌΡ–Π½Ρ–Ρ”Π²ΠΎΡ— ΠΏΠ»Π°Π·ΠΌΠΈ ΡΡ‚Π²ΠΎΡ€ΡŽΠ²Π°Π²ΡΡ ΠΎΠ΄Π½ΠΈΠΌ Π²ΠΈΠΏΠ°Ρ€ΠΎΠ²ΡƒΠ²Π°Ρ‡Π΅ΠΌ Π· використанням сплавних ΠΊΠ°Ρ‚ΠΎΠ΄Ρ–Π² TiAl, Ρ‰ΠΎ ΠΌiстили 50 ΠΎΠ±'Ρ”ΠΌΠ½ΠΈΡ… % Π°Π»ΡŽΠΌΡ–Π½Ρ–ΡŽ. Π’ΠΈΠ·Π½Π°Ρ‡Π΅Π½ΠΎ стiΠΉΠΊiстнi характСристики твСрдосплавного інструмСнту, Π·ΠΌΡ–Ρ†Π½Π΅Π½ΠΎΠ³ΠΎ покриттями TiAlN. Показано, Ρ‰ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚ΠΈ TiAlN, кондСнсовані Π· ΠΎΠΊΡ€Π΅ΠΌΠΈΡ… ΠΏΠΎΡ‚ΠΎΠΊΡ–Π² Π· Ρ„iΠ»ΡŒΡ‚Ρ€Π°Ρ†iΡ”ΡŽ Π°Π»ΡŽΠΌΡ–Π½Ρ–Ρ”Π²ΠΎΡ— ΠΏΠ»Π°Π·ΠΌΠΈ, Π±Ρ–Π»ΡŒΡˆ Ρ€Π΅Π½Ρ‚Π°Π±Π΅Π»ΡŒΠ½Ρ– Ρ– ΠΌΠ°ΡŽΡ‚ΡŒ Π±Ρ–Π»ΡŒΡˆ високі характСристики, Π½iΠΆ покриття, ΠΎΠ΄Π΅Ρ€ΠΆΠ°Π½i Π· використанням сплавних ΠΊΠ°Ρ‚ΠΎΠ΄Ρ–Π².Π˜ΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ‹ свойства ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚ΠΎΠ² TiAlN ΠΏΠΎΠ»ΡƒΡ‡Π΅Π½Π½Ρ‹Ρ… кондСнсациСй Ρ€Π°Π·Π΄Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΈ совмСщСнных ΠΏΠΎΡ‚ΠΎΠΊΠΎΠ² Ρ‚ΠΈΡ‚Π°Π½ΠΎΠ²ΠΎΠΉ ΠΈ алюминиСвой ΠΏΠ»Π°Π·ΠΌΡ‹. Π“Π΅Π½Π΅Ρ€ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅ Ρ€Π°Π·Π΄Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΏΠΎΡ‚ΠΎΠΊΠΎΠ² ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΠ²Π°Π»ΠΎΡΡŒ двумя Π²Π°ΠΊΡƒΡƒΠΌΠ½ΠΎ- The quantity of holes, N 5 10 15 Fig. 3. The quantity of holes, perforated in tempered steel (HRC 52) with a drills of Mitsubishi Carbide: – uncoated –TiN-coated coated; –TiCN –TiAlN non- filtering –TiAlN with Al-plasma filtering Π΄ΡƒΠ³ΠΎΠ²Ρ‹ΠΌΠΈ испаритСлями с Ρ‚ΠΈΡ‚Π°Π½ΠΎΠ²Ρ‹ΠΌ ΠΈ Π°Π»ΡŽΠΌΠΈΠ½ΠΈΠ΅Π²Ρ‹ΠΌ ΠΊΠ°Ρ‚ΠΎΠ΄Π°ΠΌΠΈ, ΠΏΡ€ΠΈΡ‡Π΅ΠΌ, алюминиСвая ΠΏΠ»Π°Π·ΠΌΠ° ΠΏΡ€ΠΎΡ…ΠΎΠ΄ΠΈΠ»Π° Ρ‡Π΅Ρ€Π΅Π· ΠΊΡ€ΠΈΠ²ΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½Ρ‹ΠΉ ΠΏΠ»Π°Π·ΠΌΠ΅Π½Π½Ρ‹ΠΉ Ρ„ΠΈΠ»ΡŒΡ‚Ρ€, Π³Π΄Π΅ ΠΎΡ‡ΠΈΡ‰Π°Π»Π°ΡΡŒ ΠΎΡ‚ ΠΏΠ°Ρ€ΠΎΠ² ΠΈ макрочастиц. Π‘ΠΎΠ²ΠΌΠ΅Ρ‰Π΅Π½Π½Ρ‹ΠΉ ΠΏΠΎΡ‚ΠΎΠΊ Ρ‚ΠΈΡ‚Π°Π½-алюминиСвой ΠΏΠ»Π°Π·ΠΌΡ‹ создавался ΠΎΠ΄Π½ΠΈΠΌ испаритСлСм с использованиСм сплавных ΠΊΠ°Ρ‚ΠΎΠ΄ΠΎΠ² TiAl с ΠΎΠ±ΡŠΠ΅ΠΌΠ½Ρ‹ΠΌ содСрТаниСм алюминия 50%. Π˜ΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ‹ стойкостныС характСристики твСрдосплавного инструмСнта, ΡƒΠΏΡ€ΠΎΡ‡Π½Π΅Π½Π½ΠΎΠ³ΠΎ покрытиями TiAlN. Показано, Ρ‡Ρ‚ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ‚Ρ‹ TiAlN, осаТдСнныС ΠΈΠ· Ρ€Π°Π·Π΄Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΏΠΎΡ‚ΠΎΠΊΠΎΠ² с сСпарациСй алюминиСвой ΠΏΠ»Π°Π·ΠΌΡ‹, Π±ΠΎΠ»Π΅Π΅ Ρ€Π΅Π½Ρ‚Π°Π±Π΅Π»ΡŒΠ½Ρ‹ ΠΈ ΠΎΠ±Π»Π°Π΄Π°ΡŽΡ‚ Π±ΠΎΠ»Π΅Π΅ высокими характСристиками, Ρ‡Π΅ΠΌ покрытия, ΠΏΠΎΠ»ΡƒΡ‡Π΅Π½Π½Ρ‹Π΅ с использованиСм сплавных ΠΊΠ°Ρ‚ΠΎΠ΄ΠΎΠ²

    Magnetic Anisotropy of Ultra-small Nanocrystals of CoFe2O4

    Get PDF
    Ferrimagnetic nanoparticles of CoFe2O4 with dimensions of 4-16 nm were synthesized by pyrolysis of a mixture of acetylacetonates of iron and cobalt. In the temperature range 300-500 K investigated field dependence of magnetization up o 18 kOe. Found a significant contribution of "surface" anisotropy to the effective anisotropy of the nanoparticles. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3536

    Influence of ZnO nanocrystals surface modification on structure and photovoltaic properties of MEH-PPV/nc-ZnO nanocomposite films

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    The influence of interface modifires based on perylen imide dyes and naphthyl phosphonic acid on MEH-PPV/nc-ZnO nanocomposite films morphology was stydied. The better phase compatibility between MEH-PPV and nc-ZnO was obtained if (PI1) and (PI2) were used as the IMs. Use of the IMs led to decrease the fluorescence lifetime quenching (τ₁) and to increase the quenching efficiencies (Ξ·q). It was demonstrated that all IMs increase JSC and VOC
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