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Ivair A. Santos,Jaciele M. Rosso,Luiz F. Cotica,Taiana G.M. Bonadio,Valdirlei F. Freitas,Ruyan Guo,Amar S. Bhalla 한국물리학회 2016 Current Applied Physics Vol.16 No.11
In this contribution, a promising environmentally friendly lead-free ferroelectric/polymer 0-3 composite, using polyvinylidene fluoride and barium sodium titanate niobate compounds, was synthesized and structurally and dielectrically characterized. The results suggest the complete formation of a 0-3 connected composite with enhanced dielectric properties, reaching a relative permittivity of 32 and a dissipation loss of 4%, at 1 kHz and 300 K, respectively. These dielectric features are associated with the intimate contact between the polymer and ceramic fraction in the composite that lead to the increase of the polar b-phase amount in the polymer fraction, at room temperature.
Dielectric and impedance measurements on (1-x)Ba(Fe1/2Ta1/2) O3-xBa(Zn1/3Ta2/3)O3 ceramics
Thanatep Phatungthane,Gobwute Rujijanagul,Kamonpan Pengpat,Sukum Eitssayeam,Tawee Tunkasiri,Luiz F. Cotica,Ruyan Guo,Amar S. Bhalla 한국물리학회 2014 Current Applied Physics Vol.14 No.12
In this work, ((1x)Ba(Fe1/2Ta1/2)O3-xBa(Zn1/3Ta2/3)O3), ((1x)BFT-xBZT) ceramics with x ¼ 0.00e0.12 were synthesized by the solidestate reaction method. X-ray diffraction data revealed that both the powders and ceramics were of a pure-phase cubic perovskite structure. All ceramics showed large dielectric constants. For the x ¼ 0.12 sample, a very high dielectric constant (>20,600) was observed. A lowering in the dielectric loss compared to pure BFT ceramics was observed with the BZT addition. The impedance measurements indicated that BZT has a strong effect on the bulk grain and grain boundary resistance of BFT ceramics. These results are in agreement with the measured dielectric properties. Based on dielectric and impedance results, (1x)BFT-xBZT ceramics could be of great interest for high performance dielectric materials applications due their giant dielectric constant behavior.