Structural properties of (Bi0.5Na0.5)1?xBaxTiO3 lead-free piezoelectric ceramics |
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| Authors: | Gunnar Picht Jörg Töpfer Eberhard Hennig |
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| Affiliation: | 1. University of Applied Sciences Jena, Dept. SciTec, Carl-Zeiss-Promenade 2, 07745 Jena, Germany;2. PI Ceramic GmbH, Lindenstraße, 07589 Lederhose, Germany;1. School of Advanced Materials Engineering, Changwon National University, Gyeongnam 641-773, Republic of Korea;2. Department of Materials Science and Engineering, Pohang University of Science and Technology, Gyeongbuk 790-784, Republic of Korea;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, PR China;3. Department of Materials Science, Sichuan University, Chengdu, 610064, PR China;1. Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, PR China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China |
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| Abstract: | A systematic XRD investigation of poled and unpoled ceramics of the system (1 ? x) Bi0.5Na0.5TiO3–x BaTiO3 (0 ≤ x ≤ 0.2) (BNBT) was performed. The variation of the lattice parameters confirms the existence of a morphotropic phase boundary at 0.06 ≤ x ≤ 0.08; however, significant differences in unit cell parameters between poled and unpoled states appear. Lattice distortions of the rhombohedral and tetragonal phases are significantly increased in poled samples. Dramatic changes in peak intensities of the pseudo-cubic (2 0 0) reflections between poled and unpoled samples reveal a strong enhancement of the tetragonal volume fraction in the poled state. Temperature-dependent XRD studies confirm a transition into a cubic high-temperature phase. This transition is rather smooth in the unpoled state. In poled samples, the tetragonal distortion and the tetragonal volume fraction display a different temperature variation and tetragonal regions seem to persist into the cubic phase field. |
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