Enhanced grain size effect on electrical characteristics of fine-grained BaTiO3 ceramics

Enhanced grain size effect on electrical characteristics of fine-grained BaTiO3 ceramics Fine-grained BaTiO3 ceramics with different grain sizes (96–194 nm) were prepared by microwave sintering, and the grain size (GS) effect of fine-grained BaTiO3 ceramics on the electrical properties were investigated. A change from the tetragonal to pseudocubic structure gradually takes place with the decrease of GS. As the GS increased from 96 to 194 nm, the dielectric constant increased from 1300 to 1560. The temperature capacitance coefficients satisfied the EIA X7R specifications for all the samples. Impedance analysis proved that the fine-grained ceramics have higher activation energy for both grain and grain boundary. The remnant polarization (P r ) values decrease with the decreasing of the GS, which is ascribed that the increasing of the grain boundary and internal stress would weaken the polarization of the direction of electric field. The grain boundary and defects have the pinning effects on the domain, leading the increase in E c . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

Enhanced grain size effect on electrical characteristics of fine-grained BaTiO3 ceramics

Enhanced grain size effect on electrical characteristics of fine-grained BaTiO3 ceramics

J Mater Sci: Mater Electron (2017) 28:13229–13235 DOI 10.1007/s10854-017-7158-1 Enhanced grain size effect on electrical characteristics of fine- grained BaTiO ceramics 1 1 1 1 Yu Shi  · Yongping Pu  · Yongfei Cui  · Yanjie Luo   Received: 6 March 2017 / Accepted: 15 May 2017 / Published online: 25 May 2017 © Springer Science+Business Media New York 2017 Abstract Fine-grained BaTiO ceramics with differ - capacitor (MLCC), positive temperature coefficient ther - ent grain sizes (96–194  nm) were prepared by microwave mistors, sensors and actuators etc [1–3]. Nowadays, elec- sintering, and the grain size (GS) effect of fine-grained tron devices are leading to decreasing thickness of ceramic BaTiO ceramics on the electrical properties were investi- medium layer which require reducing grain of BaTiO 3 3 gated. A change from the tetragonal to pseudocubic struc- ceramics from micro- to nano-scale. BaT iO ceramics ture gradually takes place with the decrease of GS. As the prepared by microwave sintering with fine grains approxi- GS increased from 96 to 194  nm, the dielectric constant mately 1  µm in size show excellent electric properties [4, increased from 1300 to 1560. The temperature capacitance 5]. All the experimental facts indicate that the dielectric coefficients satisfied the EIA X7R specifications for all the properties are very sensitive to the microstructural charac- samples. Impedance analysis proved that the fine-grained teristics (e.g. phase interconnectivity, grain size and shape ceramics have higher activation energy for both grain of the constituents, porosity, etc), which drive to the idea of and grain boundary. The remnant polarization (P ) values tuning the electrical properties via microstructual control decrease with the decreasing of the GS, which is ascribed [6]. However, the GS effect on electrical properties of fine- that the...
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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media New York
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-7158-1
Publisher site
See Article on Publisher Site

Abstract

Fine-grained BaTiO3 ceramics with different grain sizes (96–194 nm) were prepared by microwave sintering, and the grain size (GS) effect of fine-grained BaTiO3 ceramics on the electrical properties were investigated. A change from the tetragonal to pseudocubic structure gradually takes place with the decrease of GS. As the GS increased from 96 to 194 nm, the dielectric constant increased from 1300 to 1560. The temperature capacitance coefficients satisfied the EIA X7R specifications for all the samples. Impedance analysis proved that the fine-grained ceramics have higher activation energy for both grain and grain boundary. The remnant polarization (P r ) values decrease with the decreasing of the GS, which is ascribed that the increasing of the grain boundary and internal stress would weaken the polarization of the direction of electric field. The grain boundary and defects have the pinning effects on the domain, leading the increase in E c .

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: May 25, 2017

References

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