Preparation and characterization of K0.5Bi0.5TiO3 particles synthesized by a stirring hydrothermal method |
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| Affiliation: | 1. Laboratory of Applied Mineral Chemistry, Faculty of Sciences, University of Tunis El Manar, 2092 Tunis, Tunisia;2. Laboratoire Interdisplinaire Carnot de Bourgogne, UMR 6303 CNRS, Université Bourgogne Franche Comté, 9 Avenue Alain Savary, BP 47870, 21078 Dijon, France;1. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia;2. Department of Mechanical and Material Engineering, Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 53300, Kuala Lumpur, Malaysia;3. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia;4. School of Fundamental Science, Universiti Malaysia Terengganu, 21300, Kuala Terengganu, Terengganu, Malaysia;1. Christian Doppler Laboratory for Advanced Ferroic Oxides, Graz University of Technology, 8010 Graz, Austria;2. Institute for Chemistry and Technology of Materials, Graz University of Technology, 8010 Graz, Austria;3. Institute of Physical and Theoretical Chemistry, Graz University of Technology, 8010 Graz, Austria;1. Department of Applied Physics, School of Physics and Electronics Information, Hubei University of Education, Wuhan 430205, PR China;2. College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, PR China;3. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China;1. Materials Engineering, Indian Institute of Science, Bangalore, India;2. Materials Research Centre, Indian Institute of Science, India;3. Center of Excellence for Advanced Materials Research (CEMAR), King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | Nanoparticles of potassium bismuth titanate K0.5Bi0.5TiO3 (KBT) with an average particle size of 38 nm were prepared using a stirring hydrothermal method. The pure KBT was obtained in 8 h reaction time instead of 24–48 h for conventional hydrothermal method. X-ray diffraction, Raman spectroscopy and TG analysis were used to check the proportion of hydroxyl group existing into the crude and the calcined KBT. A Hydroxyl group was found to affect the crystallite structure parameters and cell volume. When temperature increases from 25 to 1050 °C, the tetragonal structure presents a c/a ratio which decreases from 1.048 to 1.012. TG analysis and Raman vibration at high frequencies show that c/a is affected by hydroxyl group content below 750 °C and by potassium and bismuth vacancies above this temperature. The ceramic KBT showing a 300 nm size presents an improved εr=780 and a dielectric loss tan δ=0.062 at room temperature. Electric conductivity σac was also lowered to 10?6 (Ω m)?1 with an activation energy change at 673 K from 0.35 to 0.605 eV. |
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| Keywords: | C Dielectric properties Hydrothermal synthesis Nanoparticule |
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