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Synthesis, crystal structure, phase transitions and dielectric relaxation in La3+ modified Sr0.5Ba0.5Nb2O6 ceramics
Russian version
Makinyan N.V. 1, Bulanova A. L.2, Zabolotnyi A. A. 2, Pavlenko A. V. 1
1Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
2Southern Federal University, Rostov-on-Don, Russia
Email: norair.makinyan@yandex.ru
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The crystal structure, dielectric and ferroelectric characteristics of Sr0.5Ba0.5Nb2O6 ceramics modified at the synthesis stage beyond the stoichiometry of 1 wt.% (weight percent) La2O3 (SBN50-La) have been studied. It is shown that ceramics are pure, La3+ cations are embedded in A1 positions, and the parameters of the tetragonal unit cell are a=12.4800 Angstrem, c=3.9354 Angstrem. Analysis of the ε'(T,f) and ε''(T,f) dependences revealed that SBN50-La is a relaxor ferroelectric. It is shown that the dielectric response of SBN50-La ceramics at T=83-493 K and f=20-106 Hz has a contribution from three relaxation processes. The mechanisms of these processes are discussed. Keywords: strontium barium niobate, dielectric characteristics, relaxor ferroelectric, dielectric relaxation.
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