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  • 1
    Electronic Resource
    Electronic Resource
    A Study of Amorphous Precursors for PbZrO3-PbTiO3 Based Ceramic Materials (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 343-346 
    Details
    ISSN: 1573-4846
    Keywords: PbZrO3 ; PbTiO3 ; precursors ; TGA/EGA ; EXAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Amorphous precursors for PbZrO3 and PbTiO3 ceramics were prepared from lead acetate and the transition metal n -propoxide in n-propanol or n-butoxide in n-butanol and hydrolysed with an excess of water. According to GLC and TGA/EGA analyses, the type of alkoxide group influences distinctly the structure of heterometallic precursors, i.e., oxo or acetate bridging, and the amounts of hydroxyl and organic groups bound to the metal network. The local environments of metal atoms in the amorphous precursors were also studied by EXAFS. The analysis reveals that in Pb-Zr precursors alkoxide groups modify the coordination spheres of the zirconium atoms. Conversely, local environments of both lead and titanium atoms within the analysed range of 3.4 A depend weakly on the type of alkoxide used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026495220320
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron microscope study of alkoxide-derived compositions within the PbZrO3-PbTiO3 phase diagram (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 443-446 
    Details
    ISSN: 1573-4846
    Keywords: Pb(Zr x Ti1−x )3 ; alkoxides ; morphology ; homogeneity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pb(Zr0.50Ti0.50)O3 solid solution was prepared using lead acetate and transition metal n-propoxides in n-propanol or n-butoxides in n-butanol. The complex solutions were hydrolysed with an excess of H2O. The resultant powders were calcined up to 700°C for 30 minutes in a flowing oxygen atmosphere. Scanning electron microscope analysis showed different morphologies of the resultant powders. The n-propoxide derived powder consisted of gel fragments, while the n-butoxide derived one had agglomerated submicrometre particles. EDS analysis of the powders revealed no chemical heterogeneities in the examined samples upon calcining up to 600°C, notwithstanding the type of precursor used. Both samples, calcined at 700°C, exhibited a slight deficiency of lead in the pyrochlore type phase as compared to the perovskite phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486287
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A study of amorphous precursors for PbZrO3−PbTiO3 based ceramic materials (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 343-346 
    Details
    ISSN: 1573-4846
    Keywords: PbZrO3 ; PbTiO3 ; precursors ; TGA/EGA ; EXAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Amorphous precursors for PbZrO3 and PbTiO3 ceramics were prepared from lead acetate and the transition metaln-propoxide inn-propanol orn-butoxide inn-butanol and hydrolysed with an excess of water. According to GLC and TGA/EGA analyses, the type of alkoxide group influences distinctly the structure of heterometallic precursors, i.e., oxo or acetate bridging, and the amounts of hydroxyl and organic groups bound to the metal network. The local environments of metal atoms in the amorphous precursors were also studied by EXAFS. The analysis reveals that in Pb−Zr precursors alkoxide groups modify the coordination spheres of the zirconium atoms. Conversely, local environments of both lead and titanium atoms within the analysed range of 3.4 A depend weakly on the type of alkoxide used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436863
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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