Alternating current field effect on the freezing temperature of relaxor ferroelectrics

Eugene V. Colla, Surya M. Gupta, Dwight Viehland

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Alternating current-field effects on the freezing temperature of La-modified lead magnesium niobate-lead titanate crystalline solutions for compositions near to the morphotropic phase boundary have been studied by dielectric spectroscopy. Charge imbalance due to La substitution (0-10 at.%) in [Pb(Mg1/3Nb2/3)O3]0.65(PbTiO 3)0.35 was compensated by changing the B-site cation ratio. The frequency dispersion in the dielectric constant was found to increase with increasing La substitution. Relaxor-like dielectric characteristics were induced for La concentrations greater than 5 at.%. It was also found that the dielectric constant maximum (εmax) increased and the temperature of εmax decreased with increasing ac field. In addition, a threshold electric field was observed above which nonlinearities became evident in the dielectric response and the freezing temperature was reduced.

Original languageEnglish (US)
Pages (from-to)362-367
Number of pages6
JournalJournal of Applied Physics
Issue number1
StatePublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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