Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium addition
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第6期
论文作者：Edson Cezar Grzebielucka Jo?o Frederico Haas Leandro Monteiro Eder Carlos Ferreira de Souza Christiane Philippini Ferreira Borges André Vitor Chaves de Andrade Eloísa Cordoncillo Héctor Beltrán-Mir Sandra Regina Masetto Antunes
文章页码：12 - 20
摘 要：The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied.Compositions based on the formula CaCu3Ti4-xCrxO12-σ（x = 0, 0.025, 0.050 and 0.075 mol%） are prepared by solid-state reaction. Pellets sintered at 1070℃ for 12 h are characterised by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and impedance spectroscopy. Current densityelectric 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.
Edson Cezar Grzebielucka1，Jo?o Frederico Haas Leandro Monteiro1，Eder Carlos Ferreira de Souza1，Christiane Philippini Ferreira Borges1，André Vitor Chaves de Andrade2，Eloísa Cordoncillo3，Héctor Beltrán-Mir3，Sandra Regina Masetto Antunes1
1. Programa Pós-Gradua??o em Química Aplicada, Universidade Estadual de Ponta Grossa2. Programa de Pós-Gradua??o em Ciências/Física, Universidade Estadual de Ponta Grossa3. Dpto. de Química Inorgánica y Orgánica, Universitat Jaume I
摘 要：The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied.Compositions based on the formula CaCu3Ti4-xCrxO12-σ（x = 0, 0.025, 0.050 and 0.075 mol%） are prepared by solid-state reaction. Pellets sintered at 1070℃ for 12 h are characterised by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and impedance spectroscopy. Current densityelectric 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.
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