A modified two-Stage mixed oxide synthetic route to lead magnesium niobate and lead iron niobate |
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| Affiliation: | 1. National Science Center Kharkov Institute of Physics and Technology, 61108 Kharkov, Ukraine;2. Vavilov State Optical Institute, ul. Babushkina 36-1, 193171 St. Petersburg, Russia;3. Vitreous Materials Laboratory, Department of Materials Engineering, Federal University of São Carlos, UFSCar, 13.565-905 São Carlos, SP, Brazil;4. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, 199034 St. Petersburg, Russia;5. Institut für Physik der Universität Rostock, Albert-Einstein-Strasse 23-25, 18059 Rostock, Germany;1. Department of Chemical Engineering and Process Design, Faculty of Chemistry, Silesian University of Technology, Strzody 7, Gliwice 44-100, Poland;2. Research Network ?ukasiewicz, Department of Inorganic Chemistry and Process Engineering, New Chemical Syntheses Institute, Sowińskiego 11, Gliwice 44-100, Poland |
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| Abstract: | A modified mixed oxide synthetic route has been developed for the synthesis of lead magnesium niobate Pb(Mg1/3Nb2/3)O3; PMN] and lead iron niobate Pb(Fe1/2Nb1/2)O3; PFN] powders. The formation of perovskite and pyrochlore phases in the calcined PMN and PFN powders has been investigated as a function of calcination temperature and time by XRD and DTA techniques. The particle size distribution of calcined powders was determined by laser diffraction, with the morphology, phase composition and crystal structure determined via SEM, TEM and EDX techniques. In both cases it has been found that cubic pyrochlore phases in the PbO–Nb2O5 system tend to form, as well as the perovskite phase. However, pyrochlore-free PMN and PFN powders were successfully obtained for a calcination temperature of 800°C for 4 and 3 h, respectively, without the introduction of excess PbO and/or MgO. |
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