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  • 1990-1994  (2)
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  • 1
    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
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous dilatation-temperature curves of PZT-ZrO2 composites (1993)
    Springer
    Journal of materials science 28 (1993), S. 5179-5183 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dilatation-temperature curves of the PZT-ZrO2 composites, containing 1.3–13.2 vol% ZrO2 were studied. The course of martensitic transformation (MT) of dispersed ZrO2 particles in the PZT matrix was followed. Upon cooling, a spontaneous microcrack formation occurred during the MT from tetragonal to monoclinic crystal phase of ZrO2. The phenomenon of intensive shrinkage above 800 °C upon heating is explained as a process of microcrack healing in the presence of the PbO-rich liquid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570060
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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