Morphotropic phase boundary,polymorphic phases and enhanced electrostrain/piezoelectricity in Ag1-xKxNbO3 solid-solution ceramics |
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| Affiliation: | 1. School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi''an 710021, China;2. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China;3. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;4. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;5. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;2. School of Resources, Environment and Materials, Guangxi University, Nanning 530005, China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials, Science and Engineering, Tsinghua University, Beijing 100084, China;1. Department of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China;2. Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China;3. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Fraunhofer IWM, 79108 Freiburg, Germany;3. Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;4. Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;1. Anhui Key Lab of Metal Material and Processing, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshang, Anhui 243002, PR China;2. Inner Mongolia Key Laboratory of Ferroelectric-Related New Energy Materials and Devices, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, PR China;3. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;4. School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, PR China;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620000, Russia;3. State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;4. School of Materials and Energy, Southwest University, Chongqing, 400715, China;5. Multifunctional Electronic Ceramics Laboratory, College of Engineering, Xi''an International University, Xi''an, 710077, China;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, 710049, China;2. Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 510610, China |
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| Abstract: | Ag1?xKxNbO3(AKNx (x ≤ 0.12) ceramics were prepared to understand the relationship of structure-properties driven by compositions and temperatures. The results suggested that this binary system possessed a morphotropic phase boundary (MPB) consisted of ferrielectric and ferroelectric phases with iso-symmetry at room temperature, in which domains switching together with electric-field-induced irreversible phase transition achieved a much higher electrostrain (Smax = 0.4%) than other compositions. But this MPB was destroyed after poling, leading to inferior piezoelectricity. A phase diagram was drawn after analyzing in situ XRD and dielectric data, where an almost vertical ferrielectric/antiferroelectric ? polymorphic ferroelectric MPB line starting from a triple point was proposed. As temperature increased, the piezoelectricity significant enhanced near ferroelectric orthorhombic ? monoclinic phase boundary, while the highest piezoelectricity was achieved near the monoclinic ? paraelectric phase boundary with d33 = 200 pC/N. The enhanced piezoelectricity is intimately related to the ferroelectric monoclinic possessing Pm symmetry. |
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| Keywords: | MPB Piezoelectric Electrostrain Monoclinic Polymorphic |
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