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  • 1
    Electronic Resource
    Electronic Resource
    Microwave-Assisted Synthesis of Hexagonal Barium Ferrite Powders with Nano-Particle (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 576-578 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A novel ceramic synthesis technique, microwave-assisted process was investigated for theproduction of Barium Hexagonal ferrite (BaFe12O19) powders with improved physical properties.Compared to conventional syntheticroute, the new method significantly shortened synthetic steps andreaction time. This technique involves the reaction of stoichiometric amount of metal nitrates andappropriate dosage of citric acid at microwave oven and the whole process took only 15 min. The powdersof BaFe12O19 were further investigated by X-ray diffractometer (XRD) and scanning electron microscopy(SEM). The results showed that the formation temperature of M-type Ba hexaferrite is significant low,compared to conventional furnace heating. The X-ray diffraction analysis demonstrates that the phasepurity of the microwave-processed samples were determined and compared with a conventionallyprocessed material. SEM observations indicate that the size of the synthesized BaFe12O19 powders issmall and uniform distribution. Thus, microwave irradiation is proved to be a novel, extremely facile,timesaving and energy-efficient route to the synthesis of BaFe12O19 powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.576.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and Magnetic Properties of BaLa〈sub〉0.5〈/sub〉Fe〈sub〉11.5〈/sub〉O〈sub〉19〈/sub〉/ SiO〈sub〉2〈/sub〉 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 626-628 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The paper aims at synthesizing La substituted BaM hexaferrites (BaLa0.5Fe11.5O19) in thepresence of SiO2 nano-particles by sol-gel method. Effects of SiO2 nano-particles on the structure andparticle size of hexaferrites are investigated by XRD and SEM. Magnetic properties of BaFe12O19,BaLa0.5Fe11.5O19 and BaLa0.5Fe11.5xO19/SiO2 are compared by vibrating sample magnetometer (VSM).The XRD patterns of BaLa0.5Fe11.5O19/SiO2 calcined at 1000ºC manifest that all the species havehexagonal crystal structure and no diffraction peaks of SiO2 are found. Compared with BaLa0.5Fe11.5O19powders, those synthesized in the presence of SiO2 nanoparticles present in smaller powder size, asproved by SEM. The results of VSM reveal that BaLa0.5Fe11.5O19 possesses much higher saturationmagnetization than BaFe12O19. BaLa0.5Fe11.5xO19/SiO2 also shows higher saturation magnetization thanBaFe12O19, but lower than BaLa0.5Fe11.5O19 because of addition of nano-SiO2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.626.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of Green-Emitting Phosphor Y〈sub〉3〈/sub〉Al〈sub〉5〈/sub〉O〈sub〉12〈/sub〉: Tb, Ce, Gd by Sol-Gel Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 610-612 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Green-emitting Y3Al5O12: Tb phosphor materials have been widely studied because of theirhigh luminescence efficiency and stability under the conditions of high irradiance with an electron beam.In this paper, Green-emitting phosphor of yttrium aluminum garnet (Y3Al5O12 or YAG) doped with Tb3+,Ce3+ and Gd3+ was synthesized by sol-gel method. By means of TG/DSC, XRD, and photoluminescence(PL) performance, the sintering condition and its influence on the powder’s emitting performance werestudied. The experimental results showed that, Y2.8Tb0.12 Ce0.08-x GdxAl5O12 synthesized by sol-gelmethod was a kind of phosphor of good performance. When the value of x was set at 0.04, the bestemitting performance was obtained. The Y3Al5O12: Tb, Ce, Gd particles had fine size, spherical shape,filled morphology, high crystallinity, and good brightness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.610.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of La-Mn Substituted M-Type Ba Hexaferrites by Sol-Gel Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 688-691 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: BaFe12O19 and La-Mn substituted M-type Ba hexaferrites were synthesized by sol-gelmethod and characterized by XRD, SEM and FTIR. The results showed that citric acid played animportant role in the forming process of BaFe12O19. BaFe12O19, synthesized under lower citric acidand presintered at 450°C, showed improved hexagonal crystal phase. BaLa0.5Fe11.5O19 andBa(MnLa)0.5Fe11O19 showed similar crystal structure to BaFe12O19 while Ba0.5Mn0.5Fe12O19 andBa0.5Mn0.5La0.5Fe11.5O19 showed changed crystal constant. FTIR analysis proved the formation ofnew mental-oxygen bond in substituted hexaferrites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.688.pdf
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    Paper (German National Licenses)
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