Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics |
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| Affiliation: | 1. Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China;2. Suzhou Institute of Shandong University, Suzhou 215123, China;3. School of Mechanical Engineering, Shandong University, Jinan 250061, China;4. School of Physics, Shandong University, Jinan 250010, China;1. Institut für Struktur- und Funktionskeramik, Montanuniversität Leoben, Leoben, Austria;2. Materials Center Leoben Forschung GmbH, Leoben, Austria;1. Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;2. Ferroelectric Research Laboratory, Department of Physics, A.N. College, Patna 800013, India;3. IFIMUP-IN, Physics and Astronomy Department, Faculty of Sciences, Porto University, Portugal;1. Department of Physics, C.V. Raman College of Engineering, Bhubaneswar, Odisha 752054, India;2. School of Physics, Sambalpur University, Jyoti Vihar Sambalpur, Odisha 768019, India;3. Colloids & Materials Chemistry, Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India |
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| Abstract: | In this work, we report the polymorphic phase transitions(PPT) in ferroelectric Ba0.95Sr0.05ZrxTi(1-x)O3 (BSZT, x = 0.01–0.10) ceramics synthesized by using a solid-state reaction method. The doping elements and composition ratios were selected to create adjoining PPT phase boundaries near room temperature, hence to achieve a broadened peak of piezoelectric performance with respect to composition. The temperature-composition phase diagram was constructed and the effects of PPT on the electromechanical and ferroelectric properties of the ceramics were investigated. It was revealed that the two adjacent PPT regions at room temperature showed different characteristics in property enhancement. However, due to the proximity of the phase boundaries, Ba0.95Sr0.05ZrxTi(1-x)O3 ceramics in a fairly broad range of compositions (0.02 ≤ x ≤ 0.07) showed excellent piezoelectric properties, including a large piezoelectric constant (312 pC/N ≤ d33 ≤ 365 pC/N) and a high electromechanical coupling coefficient kp (0.42 ≤ kp ≤ 0.49). |
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| Keywords: | Ferroelectric ceramics Solid solution Polymorphic phase transition Piezoelectricity Barium titanate |
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