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Microwave Dielectric Properties of Ca1+xCu3Ti4O12+x (-0.04 ≤ x ≤ 0.04) Ceramics


M. J. Abu and M. F. Ab. Rahman and R.A. Zaman and M. Ahmadipour and J. J. Mohamed and M. F. ain and Z. A. Ahmad (2016) Microwave Dielectric Properties of Ca1+xCu3Ti4O12+x (-0.04 ≤ x ≤ 0.04) Ceramics. In: 5th International Conference on Recent Advances in Materials, Minerals and Environment (RAMM) & 2nd International Postgraduate Conference on Materials, Mineral and Polymer (MAMIP). Elsevier, pp. 929-934.


Ca1+xCu3Ti4O12+x (-0.04 ≤ x ≤ 0.04) ceramics were prepared by using conventional solid-state route. The microwave dielectric properties of the samples were investigated as a function of measured frequency and the Ca content. A pure perovskite structure was obtained for samples with -0.02 ≤ x ≤ 0.02, whereas small amount of CuO and CaTiO3 appeared in the samples with x = -0.04 and 0.04, respectively, indicated that the solubility limit of Ca atom in CCTO lattice was reached for this system. Adjusting of Ca content showed a little influence on the microstructure of the ceramics. The sample with x = 0 exhibited good microwave dielectric permittivity (ɛ’ ∼ 85), which nearly constant at a broad frequency range of 1 – 35 GHz, then abruptly dropped to ∼70 at 50 GHz. The other samples showed a strongly frequency dependence of dielectric permittivity from ∼100 (at 1 GHz) to ∼10 (at 50 GHz). The dielectric loss (tan-δ) for nonstoichiometry CCTO samples is relatively higher at least an order of magnitude and displays strong frequency dependence as compared with the x = 0 sample. The existence of vacancy (oxygen and Ca) and Ca/Cu disorder are the main factor affecting ɛ’ and tan-δ values of the ceramics.

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Item Type: Book Section
Collection Type: Institution
Date: 2016
Uncontrolled Keywords: Calcium stoichimetry; Solid-state reaction; Microwave dielectric properties
Faculty/Centre/Office: Faculty of Earth Sciences
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