Compositional range and electrical properties of the morphotropic phase boundary in the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 system |
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| Authors: | M Otoničar SD Škapin M Spreitzer D Suvorov |
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| Affiliation: | 1. Unité de la Recherche de Chimie Minérale Appliquée, Département de chimie, Université de Tunis EL Manar, Campus Universitaire, 2092 Tunis, Tunisia;2. Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303CNRS, Université Bourgogne Franche Comté, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France;1. School of Materials Science and Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China;2. School of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China;1. Institute of Technology, Pedagogical University, ul. Podchorazych 2, 30-084 Krakow, Poland;2. A.Chelkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland;3. Faculty of Materials Science and Ceramics, AGH-University of Science & Technology, al.Mickiewicza 30, 30-059 Krakow, Poland;4. Faculty of Computer Science, Electronics and Telecommunications, AGH University of Science & Technology, 30-059 Krakow, Poland;5. Oles Honchar Dnipropetrovsk National University, Prosp. Gagarina 72, 49010 Dnipropetrovsk, Ukraine;1. Department of Physics, Ningbo University, 315211 Ningbo, China;2. Institute of Materials Science and Engineering, Ningbo University, 315211 Ningbo, China;1. Department of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India;2. Department of Physics, MKJK College, Rohtak 124001, Haryana, India;3. Matu Ram Institute of Engineering and Management, Rohtak 124001, Haryana, India |
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| Abstract: | We have investigated the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 (NBT–KBT) system, with its complex perovskite structure, as a promising material for piezoelectric applications. The NBT–KBT samples were synthesized using a solid-state reaction method and characterized with XRD and SEM. Room-temperature XRD showed a gradual change in the crystal structure from tetragonal in the KBT to rhombohedral in the NBT, with the presence of an intermediate morphotropic region in the samples with a compositional fraction x between 0.17 and 0.25. The fitted perovskite lattice parameters confirmed an increase in the size of the crystal lattice from NBT towards KBT, which coincides with an increase in the ionic radii. Electrical measurements on the samples showed that the maximum values of the dielectric constant, the remanent polarization and the piezoelectric coefficient are reached at the morphotropic phase boundary (MPB) (? = 1140 at 1 MHz; Pr = 40 μC/cm2; d33 = 134 pC/N). |
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