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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/37150
Title: 
Effect of PbO excess on the formation of lead magnesium niobate perovskite by the columbite method
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
0254-0584
Abstract: 
The effect of lead excess on the pyrochlore-type formation in Pb(Mg1/3Nb2/3)O-3 (PMN) powders has been investigated. The polymeric precursor method was used in the synthesis of the columbite in association to the partial oxalate method to synthesize the PMN powder samples. Structure refinement of the columbite precursor and PMN powders was carried out using the Rietveld method. The quantitative phase analysis showed that the amount of perovskite phase is not affected by PbO excess, but a great excess drives the pyrochlore-type formation so that 3 wt.% of PbO causes the predominance of Mg-containing pyrochlore phase. Using the refined data obtained from the Rietveld refinement, the compositional fluctuation in the perovskite phase was calculated from Nb/Mg ratio values and Pb occupation factor. Mg inclusion occurs concomitant with Ph one into PMN perovskite phase and this effect is directed by PbO excess during powder synthesis. (C) 2003 Elsevier B.V. All rights reserved.
Issue Date: 
15-Mar-2004
Citation: 
Materials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 84, n. 1, p. 107-111, 2004.
Time Duration: 
107-111
Publisher: 
Elsevier B.V.
Keywords: 
  • ceramics
  • Pb(Mg1/3Nb2/3)O-3
  • chemical synthesis
  • phase transitions
  • Rietveld method
Source: 
http://dx.doi.org/10.1016/j.matchemphys.2003.11.013
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/37150
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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