Giant Dielectric Response in Perovskite-Derivative CaCu3Ti4O12 Prepared by Polymerized Complex Method

C. Masingboon; P. Thongbai; S. Maensiri

doi:10.4028/www.scientific.net/AST.45.2345

Paper Titles

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Effect of Thermal Stress on the Microwave Dielectric Properties of (300-X) nm MgTiO₃ /(X) nm CaTiO₃ Thin Films
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Microstructural Evolution Model of the Sintering Behaviour and Magnetic Properties of NiZn Ferrite Nanoparticles
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Giant Dielectric Response in Perovskite-Derivative CaCu₃Ti₄O₁₂ Prepared by Polymerized Complex Method
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A High Throughput Search of Dielectric Thin Films for Tunable Devices
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Preparation and Characterization of Indium Tin Oxide for Optical Devices by Chemical Process
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Silica Additions and the Performance of PTC Thermistors
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Research on the Fabrication of BaTiO₃-Based PTCR Materials and Thermistors by Polyacrylamide Gel Process
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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 45Giant Dielectric Response in Perovskite-Derivative...

Giant Dielectric Response in Perovskite-Derivative CaCu₃Ti₄O₁₂ Prepared by Polymerized Complex Method

Abstract:

Nano-sized powders of CaCu3Ti4O12 (crystallite size of 44, 58 and 71 nm) have been synthesized by a polymerized complex method, followed by calcination the synthesized precursor at 600, 700 and 800°C in air for 8h. The CaCu3Ti4O12 powders were then characterized by XRD, FTIR and SEM. Sintering of the powders was conducted in air at 1100°C for 16h. The XRD results confirmed a typical perovskite CaCu3Ti4O12 structure in all the sintered ceramics, although the presence of a second phase of CaTiO3 was observed in the sample sintered using the powders calcined at 600°C. Microstructure of the sintered CaCu3Ti4O12 ceramics was observed by SEM and the grain size of the materials evaluated with polished using the line intercept method were found to be ~ 10-20 μm. A giant frequency-dependent dielectric constant samples (ε ~10000-60000) with weakly temperature dependence and was observed in the all the samples. The highest dielectric constant of the material was found to be ~60000 (at 140-160°C, 100 Hz) in the sample sintered using the powders calcined at 700°C. The origin of the high permittivity observed in these CaCu3Ti4O12 ceramics is attributed to the Maxwell-Wagner polarization mechanism.