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Improved dielectric properties of BaTiO3-added CaCu3Ti4O12 polycrystalline ceramics

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Abstract

The effects of the BaTiO3 (BTO) additive on the electrical properties of CaCu3Ti4O12 (CCTO) polycrystalline ceramics were systematically investigated. Various amounts of BTO powder up to 15 mol. % were added to CCTO powder. Each batch was ball-milled, pressed into pellets, and finally sintered at 1060°C for 12 h in air. Compared with pure CCTO sample (ɛ r ∼ 52,000 and tan δ ∼ 0.38 at 100 kHz), BTO-added CCTO samples commonly showed significantly reduced dielectric losses although their dielectric constants were decreased approximately by one order of magnitude (for instance, ɛ r ∼ 4,075 and tan δ ∼ 0.02 at 100 kHz for 5 mol. % BTO-added CCTO sample). In addition, the breakdown voltages of BTO-added CCTO samples were much higher than that of pure CCTO sample, and thus the leakage currents were greatly reduced at the applied voltage above ∼ 10 V. A large reduction in the dielectric losses and leakage currents is attributed to the secondary phases segregated at the CCTO grain boundary which are composed of CaTiO3, Ba4Ti12O27, and unreacted BTO.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 151-742, Korea

    Hui Eun Kim, Soon-Mi Choi, Sung-Yun Lee & Sang-Im Yoo

  2. Electronic Materials Convergence Division, Korea Institute of Ceramic Eng. & Tech., Seoul, 153-801, Korea

    Youn-Woo Hong

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  1. Hui Eun Kim
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  2. Soon-Mi Choi
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  3. Sung-Yun Lee
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  4. Youn-Woo Hong
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  5. Sang-Im Yoo
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Correspondence to Sang-Im Yoo.

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Kim, H.E., Choi, SM., Lee, SY. et al. Improved dielectric properties of BaTiO3-added CaCu3Ti4O12 polycrystalline ceramics. Electron. Mater. Lett. 9, 325–330 (2013). https://doi.org/10.1007/s13391-013-2202-7

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  • DOI: https://doi.org/10.1007/s13391-013-2202-7

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