Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics

I. P. Raevski*, V. V. Titov, M. A. Malitskaya, E. V. Eremin, S. P. Kubrin, A. V. Blazhevich, H. D. Chen, C. C. Chou, S. I. Raevskaya, I. N. Zakharchenko, D. A. Sarychev, S. I. Shevtsova

*Corresponding author for this work

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Dielectric, X-ray, Mossbauer and magnetization studies of (1 - x)PbFe 0.5Ta0.5O3-(x)PbTiO3 ceramics with 0 ≤ x ≤ 0.3 have been carried out to determine the compositional evolution of ferroelectric and magnetic phase transition temperatures. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T m of the dielectric permittivity maximum, decreases both the diffusion of this maximum and its frequency dependence. However, the Curie-Weiss temperature exceeds T m for all the compositions studied, indicating that the phase transition still remains diffused. Dilution of the (Fe, Ta)-sublattice by Ti lowers the Neel temperature T N but above a certain compositional threshold (x ≈ 0.1) fast lowering of T N stops and a new magnetic state stable in a rather wide compositional range appears. Large difference between the zero-field-cooled (ZFC) and FC magnetization-temperature curves as well as between the temperatures of magnetic phase transition determined from Mossbauer and magnetization studies for compositions with x > 0.1 implies that this state is a spin-glass phase.

Original languageEnglish
Pages (from-to)6459-6466
Number of pages8
JournalJournal of Materials Science
Issue number18
StatePublished - 1 Jan 2014

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