Effects of lanthanum dopants on the Curie-Weiss and the local order behaviors for Pb1-xLax(Fe2/3W 1/3)0.7Ti0.3O3 relaxor ferroelectrics

Cheng Shong Hong, Sheng Yuan Chu, Cheng Che Tsai, Chi Cheng Hsu, Hsiu Hsien Su

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4 Citations (Scopus)


The effects of lanthanum dopants are investigated on the dielectric responses for Pb1-xLax(Fe2/3W 1/3)0.7Ti0.3O3 ceramics. According to the experimental data and fitting results, it is concluded that the dielectric characteristics are changed from a long-range-ordered (LRO) ferroelectric state to a short-range-ordered (SRO) relaxor by increasing the amounts of lanthanum dopants. Furthermore, the spin glassy behaviors and the freezing process of local polarizations are not only affected by the ordering degree of B-site cations but also affected by the defect polar pairs. Their response mechanisms are proposed that the growth of the 1:1 ordered domain Pb1-xLax(Fe1/2W1/2)O3 is impeded since its charge imbalance is enhanced by increasing the amounts of lanthanum dopants, and the defect polar pairs of lead, tungsten and oxygen vacancy are induced by the pyrochlore phase, PbWO4 or Pb 0.99La0.01WO4, when the amount of lanthanum dopants exceed 5 mol.%.

Original languageEnglish
Pages (from-to)200-206
Number of pages7
JournalMaterials Research Bulletin
Issue number2
Publication statusPublished - 2013 Feb

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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