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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Dielectric Properties of the Nb and Co Doped Barium Titanate by Sol-Gel Auto-Ignition Synthesis Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 91-94 
    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 Nb and Co doped barium titanate was synthesized by sol-gel auto-ignition synthesisprocess (abbreviated SAS) and compared with the doped powder of the same composition prepared byconventional ball milling process. The phase structure, morphology of the two as-obtained powders andcorrelative dielectric properties of sintered BaTiO3-based ceramics were measured. The XRD analysisdemonstrated that the SAS powder was the Ba(M0.047Ti0.953)O3(M=Nb, Co) solid solution based onBaTiO3; it further suggested that Nb and Co cations could replace the Ti ions and reach reciprocal balanceof acceptors and donors during the decomposition step of the organic fuel by igniting the dried gel. TEMobservation showed that the Ba(M0.047Ti0.953)O3(M=Nb, Co) particles were spherical with the size rangedfrom 30 to 110nm. Furthermore, it was found that the value of the Curie temperature of both the dopedpowders was being lowered in comparison with pure BaTiO3 (Tc≈128ºC ); and the dielectric constant atroom temperature of the SAS powder was 5840, which was much higher than that of the conventional ballmilling doped powder(3013). It was attributed to the maximum homogeneous distribution of dopants inBa-Ti initial solution at atomic level via the SAS process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.91.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of Characteristics of BaTiO〈sub〉3〈/sub〉 Prepared by Different Process (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 1643-1646 
    Details
    ISSN: 1662-9752
    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: Barium titanate powder has been prepared using sol-gel auto-ignition synthesis process and was compared with two commercial high purity BaTiO3 powders prepared by precipitation from oxalate precursor and by hydrothermal synthesis. Characterization by x-ray fluorescence, XRD, field emission scanning electron microscopy, SEM and BET revealed significant difference, particularly in particle size and agglomerate structure, resulting in different microstructure and dielectric property. The sol-gel auto-ignition synthesis process yielded weakly agglomerated powder with average particle size of 50 nm. This property is favorable for sintering and dielectric property
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.1643.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Process for Non-Agglomerated Nanometer-Sized Barium Titanate Powders by Sol-Gel Auto-Igniting Synthesis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 613-616 
    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: Non-agglomerated nano-sized BaTiO3 powders were prepared by a 3 step decomposition of barium titanyl citric acid chelate derived from Ba(NO3)2-TiO(NO3)2-citric acid-NH4NO3 based complex compound system. The 1st step was the thermal treatment of chelate wet gel at 150ºC for 40min to remove water and non-bridging hydroxyl groups and to form expanded gel intermediate. The 2nd step was the decomposition of the organic fuel by igniting expanded gel intermediate at 300ºC. The 3rd step was the formation of the high purity BaTiO3 by calcining the decomposed powders at 700°C for 2 hours. The most expanded gel intermediate was found to be a decisive factor for the elimination of hard agglomerate. In addition, the initial oxidant/fuel molar ratio was shown to strongly influence the characteristics of the powders thus obtained. The optimum oxidant/fuel value was 3 for obtaining non-agglomerated pure BaTiO3 powders with a particle size of 50 nm. Theagglomerate degree of BaTiO3 powders was determined by particle morphology and uniformity of the green compact microstructure observed by field emission scanning electron microscopy and scanning electron microscope
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.613.pdf
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    Paper (German National Licenses)
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