Dielectric and Microstructural Properties of PbO Doped BaTiO3
Shoumya Nandy Shuvo1, Sujit Saha2, Md. Miftaur Rahman3
1Shoumya Nandy Shuvo, B.Sc. in Materials and Metallurgical Engineering, Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.
2Sujit Saha, B.Sc. in Materials and Metallurgical Engineering, Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.
3Md. Miftaur Rahman, Assistant Professor, Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.
Manuscript received on June 30, 2015. | Revised Manuscript received on July 15, 2015. | Manuscript published on July 15, 2015. | PP: 11-17 | Volume-3 Issue-8, July 2015. | Retrieval Number: H0918073815/2015©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The Barium Titanate (BaTiO3 ) based ceramics has potential technological applications in multilayer Ceramics Capacitors (MLCC), thermistors, self-regulating electric heating system, transducers etc. The aim of the research is to find out the structural modifications and corresponding change in properties of BaTiO3 when small amount of glass was added. Lead oxide (PbO) was used as glass for the doping which was in the powder form. In this research the effects of different level of PbO doping, sintering parameters and dielectric properties of PbO doped BaTiO3 were observed and studied. At first, PbO was mixed with pure BaTiO3 nanopowder at two different compositions by ball milling. Mixed powder was dried and after the addition of binder, the powder was pressed into pellets with the 5 ton pressure. After that, the green pellets were again dried. Then sintering was done at 8000C in a muffle furnace. After sintering, percentage theoretical density was measured. Then, using the ‘Precision Impedance Analyzer’, Dielectric constant, Dielectric loss and Capacitance were observed for the two different doping levels up to 10MHz frequency. Scanning electron microscopy (SEM) of the sample was then performed to observe the microstructural properties precisely. The result of the experiment was quite fascinating. It is found out that by modifying the sintering parameters and doping level of PbO with BaTiO3 , better dielectric properties can be attained. Scanning Electron Micrograph indicates that by increasing the doping level of PbO, grain refinement is possible within 100nm range with precise uniformity.
Keywords: Barium Titanate based ceramic, Nano-doping, Di-electric constant, Di-electric loss, Grain refinement