Effects Of Electrode Materials On Electrical Properties Of CaCu3Ti4O12 At 100 Hz – 1 Ghz
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Date
2013-07
Authors
Sulaiman, Muhammad Azwadi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
CaCu3Ti4O12 (CCTO) has attracted much interest because of its extraordinary high dieletric constant of 100,000 at room temperature and very small temperature dependence in a broad temperature range from 100 K to near 400 K. This high dielectric constant offers opportunities in miniaturization of electronic application nowadays. However, CCTO also possesses high dielectric loss which is undesirable in electronic applications. To lower the dielectric loss, it is necessary to understand the origin of polarization responds and relaxation mechanism in CCTO. Using wide frequency impedance spectroscopy (IS) from 100 Hz to 1 GHz, the origins of polarization effect can be revealed. One of the important origins is the used of different electrode materials which determine the contact condition to the bulk CCTO. A research was carried out to study the effect of electrode materials to the electrical properties of CCTO at the frequencies of 100 Hz to 1 GHz. Samples were prepared through solid state reaction methods and starting materials of CaCO3, CuO and TiO2 has been used. After the characterization, the starting materials were mixed for 1 hour and thermal analysis was done. Mixed powder was calcined at 900 to 1000ºC for 3 to 6 hours. Phase analyses and microstructure observation was carried out. Calcination at 1000ºC for 3 hours produced almost single phase of CCTO. The calcined powder was pressed into pellet forms and the sintering processes were done between 1000 to 1050ºC for 3 to 10 hours. X-ray diffraction (XRD) analisys indicated that sintering at 1030ºC and below increased the lattice parameter and long soaking time until 10 hours at 1040ºC has decreased the lattice parameter.
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Keywords
Electrode Materials On Electrical Properties , Cacu3ti4o12 At 100 Hz – 1 Ghz