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Dielectric,ferroelectrics properties and impedance spectroscopy analysis of the[(Na_(0.535)K_(0.480))_(0.966)Li_(0.058)](Nb_(0.90)Ta_(0.10))O_(3)-based lead-free ceramics

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Journal of Advanced Dielectrics 2015年第1期5卷 50-56页

作者： M.Saidi A.Chaouchi S.D'Astorg M.Rguiti C.Courtois Laboratoire de Chimie Appliquée et Génie Chimique de l'UniversitéMouloud Mammeri de Tizi-Ouzou Algérie Laboratoire des Matériau Céramiques et Procédés Associés—Universitéde Valenciennes et du Hainaut-Cambrésis Boulevard Charles de Gaull 59600 MaubeugeFrance University of Lille Nord de France F-59000 Lille France

Polycrystalline of[(Na_(0.535)K_(0.480))_(0.966)Li_(0.058)](Nb_(0.90)Ta_(0.10))O_(3)samples were prepared using the high-temperature solid-state reaction technique.X-ray diffraction(XRD)analysis indicates the formation of a single-phase with orthorhombic *** impedance plots were used as tool to analyze the electrical behavior of the sample as a function of frequency at different *** AC impedance studies revealed the presence of grain effect,from 425℃*** impedance analysis indicated non-Debye type dielectric *** Nyquist plot showed the negative temperature coefficient of resistance(NTCR)characteristic of *** AC conductivity results were used to correlate with the barrier hopping(CBH)model to evaluate the binding energy(W_(m)),the minimum hopping distance(R_(min)),the density of states at Fermi level(N(E_(f))),and the activation energy of the compound.

关键词： lead-free piezo-ceramics dielectric properties AC impedance spectroscopy dielectric relaxation conductivity

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Dielectric relaxation and modulus spectroscopy analysis of(Na_(0.47)K_(0.47)Li_(0.06))NbO_(3) ceramics

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Journal of Advanced Dielectrics 2017年第3期7卷 37-47页

作者： Md Kashif Shamim Seema Sharma Sangeeta Sinha Eqra Nasreen Materials Research Laboratory Department of Physics A.N.College Patna 800013India Department of Environmental Science A.N.College Patna 800013India

We have investigated the structure,dielectric and electrical properties of lead-free polycrystalline (Na_(0.47)K_(0.47)Li_(0.06))NbO_(3) ceramics as a function of temperature and frequency in order to understand the intrinsic contribution of grain/bulk and grain boundary effects toward the dielectric response as well as the electrical conduction mechanism in the samples fabricated by microwave sintering method.X-ray diffraction analysis exhibits perovskite structure with orthorhombic symmetry,which is well supported by the Raman spectroscopic analysis.A minor secondary impurity phase of tungsten bronze structure was observed for samples sintered at 1050℃,which gets weaker for samples sintered at 1150℃.Dielectric permittivity was enhanced by 50%,although there was a reduction in the dielectric loss by about 50%at Curie temperature(450℃)for samples sintered at 1150℃.Complex impedance spectroscopic analysis indicated non-Debye-type dielectric relaxation present in the samples,and this phenomenon followed thermally activated process related to hopping *** plot showed the negative temperature coefficient of resistance,characteristic of the samples.

关键词： lead-free piezo-ceramics dielectric properties AC impedance spectroscopy dielectric relaxation negative temperature coefficient of resistance(NTCR).

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