NDLI: Structural and electrical properties of a new lead free tungsten bronze ferroelectric ceramics Na$_{2}$Ba$_{2}$Eu$_{2}$W$_{2}$Ti$_{4}$Nb$_{4}$O$

Content Provider	Springer Nature Link
Author	Saparjya, S. Behera, S. Behera, B. Das, Piyush R.
Copyright Year	2016
Abstract	Lead free polycrystalline sample of Na$_{2}$Ba$_{2}$Eu$_{2}$W$_{2}$Ti$_{4}$Nb$_{4}$O$_{30}$ was prepared using high-temperature (~1200 °C) solid-state reaction technique. Room temperature X-ray structural analysis confirms the formation of single phase compound in orthorhombic crystal structure. The surface morphology of the sintered sample recorded by scanning electron microscope exhibits a uniform grain distribution. The compositional characterization of the sample was carried out using energy dispersive spectroscopy. Detailed studies of the nature of variation of dielectric constant and tangent loss with temperature indicate possible existence of ferroelectricity in the material. The temperature dependence of electrical parameters (impedance, modulus, etc.) of the material exhibits a strong correlation of its micro-structure (i.e., bulk, grain boundary, etc.) with the electrical parameters. The hopping mechanism for electrical transport properties of the system with non-exponential type of conductivity relaxation was suggested on the basis of electrical modulus analysis. The frequency dependence of ac conductivity suggests that the material obeys Jonscher’s universal power law. The temperature dependence of dc conductivity of the compound follows Arrhenius equation. Ferroelectric property of the compound was confirmed from polarization (hysteresis) study.
Starting Page	3843
Ending Page	3850
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	4
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-11-12
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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