High Dielectric Constant Ceramics

Topics: Dielectric, Permittivity, Maxwell's equations Pages: 3 (989 words) Published: July 5, 2012
1Department of Physics, M.M.H. (P.G.) College, Ghaziabad (U.P.) India 2Department of Applied Sciences, Mangalayatan University, Aligarh (U.P.) India E. mail: sanjesh_phd@rediffmail.com
In this paper, an attempt has been made to study dielectric properties of CaCu3Ti4O12 (CCTO) ceramics. For this, CCTO was prepared by the conventional oxide route. The dielectric constant and dielectric loss were measured within the frequency range from 10 Hz to 106 Hz and the temperature ranging from 50°C to 300°C. The results showed that the dielectric constant and dielectric loss of the sample are frequency dependent and temperature dependent. Dielectric constant and dielectric loss increases with decreasing frequency and increasing temperature due to interfacial polarization. Introduction:

Dielectric materials with high dielectric constant, good thermal stability and Ba/Pb-free have particularly attracted ever-increasing attention for their practical applications in microelectronics such as capacitors and memory devices [1]. Recently, calcium copper titanate (CCTO), a perovskite-like (ABO3) body-centered cubic oxide has attracted great attention for its giant dielectric constant. In CCTO, Ca and Cu ions reside at the A-sites, while Ti cations occupy the B-site. CCTO shows great promise in dielectric applications owing to its essentially temperature and frequency independent dielectric constants ranging from about 10,000 for polycrystalline powders to 100,000 for single crystals [2].CCTO does not undergo any structural change over the large temperature range (from 100 to 600K) although its dielectric constant abruptly decreases to less than 100 below 100K, showing a Debye-like relaxation. This excellent property renders this material particularly attractive for a wide range of applications [3]. In this paper, we report the dielectric...
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