Electron microscopy, XRD, dielectric, and Mossbauer studies of Li-doped Pb(Fe 0.5 Nb 0.5 )O 3 ceramics sintered from mechanically activated powders

A. A. Gusev, S. I. Raevskaya, I. P. Raevski*, V. P. Isupov, E. G. Avvakumov, S. P. Kubrin, H. D. Chen, V. V. Titov, T. A. Minasyan, C. C. Chou, S. V. Titov, M. A. Malitskaya

*Corresponding author for this work

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Abstract

X-ray diffraction (XRD) studies of the phases formed on the surface of the Li-doped PbFe 0.5 Nb 0.5 O 3 (PFN) ceramics sintered under different conditions from the mechanically activated mixture of oxides and Li 2 CO 3 have been carried out. At sintering temperatures exceeding 800°C a partial evaporation of PbO leads to the formation of pyrochlore Pb 2 Fe 4 Nb 4 O 21 and lithium ferrites LiFeO 2 and LiFe 5 O 8 phases in the surface layer about 100 m thick. An increase of the Neel temperature by more than 40 K, as compared to single crystal, was achieved in the mechanically activated PFN powder sintered at 600°C.

Original languageEnglish
Pages (from-to)250-260
Number of pages11
JournalFerroelectrics
Volume496
Issue number1
DOIs
StatePublished - 27 May 2016

Keywords

  • ferroelectric
  • Li-doped lead iron niobate
  • mechanical activation
  • phase transition

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