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Fabrication and characterization of colossal dielectric response of polycrystalline Ca1-xSrxCu3Ti4O 12 (0≤x≤1) ceramics

Title
Fabrication and characterization of colossal dielectric response of polycrystalline Ca1-xSrxCu3Ti4O 12 (0≤x≤1) ceramics
Authors
Lee S.Y.Yoo D.-K.Lee J.Jo W.Hong Y.-W.Kim Y.-H.Yoo S.-I.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2012
Journal Title
Materials Research Society Symposium Proceedings
ISSN
0272-9172JCR Link
Citation
vol. 1454, pp. 81 - 87
Indexed
SCOPUS scopus
Abstract
We report the microstructures and dielectric properties of Ca 1-xSrxCu3Ti4O12 (C 1-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 SrCu3Ti4O 12 (SCTO) compound may not exist. While the C0.6S 0.4CTO 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. © 2012 Materials Research Society.
DOI
10.1557/opl.2012.1071
ISBN
9781605114316
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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