Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium addition
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comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
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INVESTIGACIONMetadata
Title
Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium additionAuthor (s)
Date
2019-11-17Publisher
ElsevierBibliographic citation
GRZEBIELUCKA, Edson Cezar, et al. Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium addition. Journal of Materials Science & Technology, 2020, 41: 12-20.Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S1005030219304335Version
info:eu-repo/semantics/acceptedVersionSubject
Abstract
The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied. Compositions based on the formula CaCu3Ti4-xCrxO12-δ (x = 0, 0.025, 0.050 and 0.075 mol%) are prepared by solid-state ... [+]
The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied. Compositions based on the formula CaCu3Ti4-xCrxO12-δ (x = 0, 0.025, 0.050 and 0.075 mol%) are prepared by solid-state reaction. Pellets sintered at 1070 °C for 12 h are characterised by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and impedance spectroscopy. Current density-electric field, dielectric loss and permittivity measurements are also carried out. Rietveld refinement showed the substitution of Cr(III) on the Ti(IV) site, with the maximum substitution for x = 0.025 mol%. The generation of electrical defects in the grain boundary region by chromium doping is responsible for increasing the electric breakdown field strength and nonlinearity coefficient at room temperature from 1723 V/cm and 5.29 for x = 0 mol% to 3431 V/cm and 8.16 for x = 0.025 mol%. This composition shows the greatest improvement in ceramic varistor parameters. [-]
Investigation project
Ministerio de Economía y Competitividad (project MAT2016-80410-P) ; Universitat Jaume I (project No. UJIB-2016-38)Rights
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