Investigation of Grain Size Effect on the Impedance of CaCu₃Ti₄O₁₂ from 100 Hz to 1 GHz of Frequency

Abstract:

CaCu₃Ti₄O₁₂ (CCTO) is a cubical perovskite phase and sintered ceramics exhibit very high dielectric constant at room temperature. The speculated origins of the high dielectric constant are the existence of insulative barrier layer at grain boundaries and domain boundaries which created an internal barrier layer capacitance (IBLC) at the microstructure of CCTO. The relation of grains and domains electrical resistance were studied in this work by using impedance spectroscopy (IS). A series of samples with different heat treatment temperature were tested to investigate their microstructure by using field emission scanning electron microscopy (FESEM). The grains and domains resistance was calculated from a wide frequency range of impedance complex plane measurement (100 Hz to 1 GHz). The FESEM and IS analyses showed the dependency of grains and domains resistance to average grains size of CCTO microstructure.

• Periodical: Advanced Materials Research (Volume 620)
• Pages: 230-235
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.620.230
• Online since: December 2012
• Authors: Muhammad Azwadi Sulaiman, Sabar Derita Hutagalung, Zainal Arifin Ahmad, Mohd Fadzil Ain
• Keywords: CCTO, Domain, Grain Effect, High-Frequency, Impedance, Insulative Layer

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