[PDF]     http://dx.doi.org/10.3952/lithjphys.51416

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 51, 265–269 (2011)


DIELECTRIC PROPERTIES OF Pb(Fe1/2Ta1/2)O3 CERAMICS OVER 70–300 K TEMPERATURE RANGE
K. Bormanis a, A. Kalvane a, A.I. Burkhanov b, and A.M. Serezhkin b
a Institute of Solid State Physics, University of Latvia, Riga, Latvia
E-mail: bormanis@cfi.lu.lv
b Volgograd State Architectural and Engineering University, Volgograd, Russia

Received 12 October 2011; revised 8 December 2011; accepted 8 December 2011

The studies of dielectric response in ferromagnetic lead ferrotantalate Pb(Fe1/2Ta1/2)O3 are reported over a wide range of temperature under the applied bias field. The features of dielectric nonlinearity deduced from behaviour of reverse ε'(E=) curves at different temperatures, including regions of ferroelectric phase transition and vicinity of the Néel point, are examined. Obtained results indicate a substantial broadening of the ferroelectric phase transition. The results are discussed with respect to effects of ferroelectric ordering in relaxor materials of such kind.
Keywords: ferroelectrics, ceramics, ferrotantalate, dielectric properties, polarization
PACS: 77.80.-e, 77.84.Dy, 77.22.Ch, 75.85.+t


Pb(Fe1/2Ta1/2)O3 KERAMIKOS DIELEKTRINĖS SAVYBĖS ESANT 70–300 K TEMPERATŪRAI
K. Bormanis a, A. Kalvane a, A.I. Burkhanov b, A.M. Serezhkin b
a Latvijos universiteto Kietojo kūno fizikos institutas, Ryga, Latvija
b Volgogrado valstybinis architektūros ir inžinerijos universitetas, Volgogradas, Rusija

Aprašomi feromagnetinio švino ferotantalato Pb(Fe1/2Ta1/2)O3 dielektrinio atsako tyrimai plačiame temperatūros intervale esant išoriniam laukui. Nagrinėtos dielektrinės skvarbos netiesiškumo savybės, nustatytos iš grįžtamosios dielektrinės skvarbos ε'(E=) kreivių skirtingoje temperatūroje, įskaitant feroelektrinio fazinio virsmo sritis ir Nejelio (Néel) taško aplinką. Gauti rezultatai rodo, kad feroelektrinis fazinis virsmas yra pastebimai išplitęs. Rezultatai aptariami lyginant su feroelektriniu susitvarkymu panašiuose feroelektriniuose relaksoriuose.


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