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  • 2005-2009  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The Influence of Tribophysical Activation on Zn〈sub〉2〈/sub〉TiO〈sub〉4〈/sub〉 Synthesis (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 518 (July 2006), p. 131-136 
    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: The influence of tribophysical activation on Zn2TiO4 synthesis along with the changes inpowders during tribophysical treatment was observed. Mixtures of ZnO and TiO2 powders weremechanically activated using a high-energy ball mill at different time intervals from 0 to 300minutes. XRD was performed in order to obtain information about phase composition variations.Microstructure parameters were revealed from an approximation method. Particle size distributionalong with scanning electron microscopy gave very useful information about powder morphology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.518.131.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural Properties of PZT Thin Films Deposited on LaNiO〈sub〉3〈/sub〉-Coated Substrates (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 555 (Sept. 2007), p. 315-320 
    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: The modified polymeric precursor method (Pechini method) was successfully used forthe preparation of epitaxial and polycrystalline ferroelectric Pb(Zr0.52Ti0.48)O3 (PZT) thin films.Films were deposited on LaNiO3 (LNO) – coated silicium (1 0 0) and platinum substrates(Pt (1 1 1)/Ti/SiO2/Si) by spin coating technique. LNO electrodes were also prepared by the Pechinimethod and treated under different thermal treatment conditions to obtain films with differentstructural and microstructural properties. Investigation of PZT microstructure was performed as afunction of orientation and morphology of the bottom electrode, as well as of thermal treatmentconditions. Grain size and morphology were analyzed by AFM, while the quality and orientation ofPZT films were determined by GIXRD analysis. It has been found that the proposed thermaltreatment on a hot plate, with slow heating rate and long annealing time, can result in the formationof epitaxial PZT films on Si and LNO-coated Si substrates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.555.315.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dilatometer Investigations of Reactive Sintering of Zinc Titanate Ceramics (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 494 (Sept. 2005), p. 411-416 
    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: Starting powder mixtures of ZnO and TiO2, at the molar ratio that is in accordance with the stoichiometry of zinc titanate Zn2TiO4, were mechanically activated using a planetary ball mill in different time intervals from 0 to 90 minutes. X-ray diffraction analysis, scanning electron microscopy and non-isothermal dilatometric measurements were performed in order to investigate zinc titanate formation. Processes occurring during mechanical activation led to the formation of a specific structure of obtained powders that promoted and accelerated solid-state reactions and densification during sintering. The main conclusion based on analysis is that mechanical activation enables better compaction of activated powders, i.e. possibility of achieving higher densities of green bodies without binders, but first of all that Zn2TiO4 ceramics can be obtained by mechanical activation after a certain time with appropriate thermal treatment, i.e. heating rate and sintering time, at temperatures lower than those when non-activated mixtures were used
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.494.411.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sintering of Mechanically Activated Powders (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 619-628 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Mechanical activation (MA) is used extensively as a relatively no expensive method forthe modification of physico-chemical properties of dispersed systems in technologies for obtainingpowders and ceramics. Different processes that occur during MA of powders lead to the formationof specific structures that promote and accelerate solid-state reactions, as well as densificationduring sintering. Changes of particle size and structure during MA of the ceramic parent materialare the sources of the morphological and structural metastability of the starting powders and theycan affect the sintering process, positively or negatively. Many properties of final polycrystallineceramics strongly depend on a green body microstructure and on conditions under which the greenbody is sintered. From the other side green body microstructure depend on a powderscharacteristics such as morphology, particle and pore size distributions. Regarding above mentionedactivation and sintering must therefore be carried out under strictly controlled conditions in order toavoid influences that might cause a deterioration of the final properties of the ceramic materials.The present study is focused on the processes of sintering that occurred in mechanically activatedsingle and multiphase oxide powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.619.pdf
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    Paper (German National Licenses)
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