1National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices and Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea
2Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
3Department of Chemistry, Jadavpur University, Kolkata 700032, India
4Department of Biological Sciences, Presidency University, Kolkata 700073, India
5Department of Chemistry, Sidho-Kanho-Birsha University, Purulia 723101, India
Adv. Mater. Lett., 2015, 6 (6), pp 492-500
Publication Date (Web): May 28, 2015
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Small amounts of Cu and Al-K substitution on the A and B site of BaTiO3, respectively resulting a solid solution of the type Ba1-xCuxTi1-x(AlK)xO3 (BCTAK) [x = 0.05, 0.10, 0.15, 0.20] have been investigated. The compositions have been prepared in the nanocrystalline range by chemical route. X-ray diffraction revealed the tetragonal (P4/mmm) phase. Average crystallite size and particle size were found to be in the range between 25 nm and 35 nm which were analyzed through X-ray diffraction and transmission electron microscopy respectively. A dielectric study of these compounds as a function of temperature suggested that with increasing substitution concentration the dielectric constant decreased and the Curie temperature shifted towards the lower temperature side. Discontinuous grain growth accompanied with excellent dielectric diffuseness was found with increasing concentration of substitution. The dielectric diffuseness γ was found to be maximum to 1.91 at the substitution of BCTAK x = 0.20. The activation energy, Ea was found to decrease along with an increase in conductivity with increasing substitution concentration in BCTAK.
Chemical synthesis, dielectric properties, electrical conductivity, ferroelectricity.