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Fabrication and Characterization of Colossal Dielectric Response of Polycrystalline Ca1-x SrxCu3Ti4O12 (0≤x≤1) Ceramics

Published online by Cambridge University Press:  29 May 2012

Sung Yun Lee
Affiliation:
Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
Duk-Keun Yoo
Affiliation:
Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
Jihye Lee
Affiliation:
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
William Jo
Affiliation:
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
Youn-Woo Hong
Affiliation:
Bio-IT Convergence Center, Korea Institute of Ceramic Eng. & Tech., Seoul 153-801, Korea
Young-Hwan Kim
Affiliation:
Nano-Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
Sang-Im Yoo
Affiliation:
Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
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Abstract

We report the microstructures and dielectric properties of Ca1-xSrxCu3Ti4O12 (C1-xSxCTO, 0≤x≤1) ceramics sintered at the various sintering temperatures ranging from 1000 to 1060˚C in air. The linear increase in lattice parameter in C1-xSxCTO (0≤x≤1) ceramics is observable for the full range of substitution. However, the second phases of SrTiO3 and CuO start to occur from the composition of x=0.8, implying that a stoichiometric SrCu3Ti4O12 (SCTO) compound may not exist. While the C0.6S0.4CTO and C0.4S0.6CTiO samples exhibit relatively lower dielectric constant (εr) of ∼40,000 below 1 kHz, the CaCu3Ti4O12 (CCTO) and SCTO show the extremely high εr values of ~120,000 and ∼180,000, respectively. Complex impedance (Z*) and modulus (M*) spectroscopy revealed that the capacitance (C) and resistivity (ρ) values of grain boundary in all samples are much higher than those of grains.

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Articles
Copyright
Copyright © Materials Research Society 2012

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References

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