May 17, 2018 - [15] Kum-Jin Park, Chang-Hoon Kima, Yeo-Joo Yoon, Soon-Mo Song, .... Z.J. Shen, G.R. Han, The Colossal dielectric performance of pure ...
Journal of Alloys and Compounds 762 (2018) 49e61
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Effect of sintering temperature on structural, electrical, and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics Mahmoud S. Alkathy a, Abdo Hezam b, K.S.D. Manoja a, Jingwei Wang c, Chun Cheng c, K. Byrappa b, K.C. James Raju a, * a
School of Physics, University of Hyderabad, Hyderabad, 500046, India Center for Materials Science and Technology, Vijana Bhavana, University of Mysore, Manasagangothiri, Mysuru, 570006, India Department of Materials Science and Engineering and Shenzhen Key Laboratory of Nanoimprint Technology, Southern University of Science and Technology, Shenzhen, 518055, PR China b c
a r t i c l e i n f o
a b s t r a c t
Article history: Received 13 March 2018 Received in revised form 29 April 2018 Accepted 11 May 2018 Available online 17 May 2018
This article reports the influence of sintering temperature on the structural, dielectric and ferroelectric properties of lead-free Ba0.98La0.01Na0.01TiO3 ceramics synthesized by conventional solid-state reaction technique. The calcination of the ceramic powders has been accomplished using microwave system at 1000 C for 30 min and sintered at four different temperatures, i.e., 1250, 1300, 1350 and 1400 C for 4 h. The XRD analysis along with Rietveld refinement confirms that all samples show a single phase tetragonal structure. The confirmation of tetragonal phase structure has been carried out using Raman study. The elemental composition and chemical states of the sintered pellets have been determined using XPS study. The investigation of Scanning Electron Microscopy (FE-SEM) revealed that the grain size increases with rising sintering temperature. The temperature and frequency dependence of dielectric properties has been investigated using Impedance spectroscopy in the frequency range of 60 Hz 1 MHz and temperature range of RT to 150 C. The Ba0.98La0.01Na0.01TiO3 ceramic sintered at 1350 C obtains the optimum dielectric constant of 2583 and dielectric loss
