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S. Eitssayeam U. Intatha G. Rujijanagul K. Pengpat T. Tunkasiri 《Applied Physics A: Materials Science & Processing》2006,83(2):295-299
The structural and electrical properties of (1-x)PbZr0.52Ti0.48O3–xBaFe0.5Nb0.5O3 ceramics system with the composition near the morphotropic phase boundary were investigated as a function of the BaFe0.5Nb0.5O3 content by X-ray diffraction (XRD) and dielectric measurement technique. Studies were performed on the samples prepared by
solid state reaction for x=0.1, 0.2, 0.3, 0.4 and 0.5. The XRD analysis demonstrated that with increasing BFN content in (1-x)PZT–xBFN,
the structural change occurred from the tetragonal to the cubic phase at room temperature. Changes in the dielectric behavior
were then related to these structural depending on the BFN content.
PACS 77.84.Dy; 77.22.Ch; 77.22.Gm 相似文献
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The phase transition and electrical properties of Ba(Ti0.9Sn0.1)O3 ceramics with B2O3 added were investigated to explore the effect of B2O3 addition on enhanced densification and dielectric constant of these ceramics. With increasing B2O3 content, a linear reduction of ferroelectric to paraelectric transition temperature was observed. In addition, higher B2O3 concentrations enhanced a ferroelectric relaxor behavior in the ceramics. Changes in this behavior were related to densification, second-phase formation and compositional variation of the ceramics. 相似文献
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Uraiwan Intatha Sukum Eitssayeam John Wang Tawee Tunkasiri 《Current Applied Physics》2010,10(1):21-25
Single-phase BaFe0.5Nb0.5O3 (BFN) ceramics were prepared by solid-state reaction method and were characterized by X-ray Diffraction (XRD) technique. Then, impedance spectroscopy measurements were conducted in a frequency range from 100 Hz to 1 MHz and in a temperature range from 293 to 600 K. Relaxation phenomena of non-Debye type have been observed in the BFN ceramics, as confirmed by the Cole–Cole plots. The higher values of ε′ at the lower frequencies are explained on the basis of the Maxwell–Wagner (MW) polarization model. Complex impedance analysis enables us to separate the contributions from grains and grain boundaries of our samples. We found that at higher temperatures grain boundary resistance is higher than grain resistance, irrespective of composition. 相似文献
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Thanatep Phatungthane Gobwute Rujijanagul Kamonpan Pengpat Sukum Eitssayeam Tawee Tunkasiri Luiz F. Cotica Ruyan Guo Amar S. Bhalla 《Current Applied Physics》2014,14(12):1819-1824
In this work, ((1−x)Ba(Fe1/2Ta1/2)O3-xBa(Zn1/3Ta2/3)O3), ((1−x)BFT-xBZT) ceramics with x = 0.00–0.12 were synthesized by the solid–state 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 = 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, (1−x)BFT-xBZT ceramics could be of great interest for high performance dielectric materials applications due their giant dielectric constant behavior. 相似文献
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