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Effects of Na/K ratio on the phase structure and electrical properties of Na_xK_(1-x)NbO_3 lead-free piezoelectric ceramics 被引量：1

Effects of Na/K ratio on the phase structure and electrical properties of Na_xK_(1-x)NbO_3 lead-free piezoelectric ceramics
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摘要 Lead-free piezoelectric NaxK1-xNbO3（x = 0.3-0.8）（NKN） ceramics were fabricated by normal sintering at 1060°C for 2 h.Microstructures and electrical properties of the ceramics were investigated with a special emphasis on the influence of Na content.The grain size of the produced dense ceramic was decreased by increasing Na content.A discontinuous change in the space distance was found at the composition close to Na0.7K0.3NbO3 ceramic, which indicates the presence of a transitional composition between two different orthorhombic phases, which is similar to the behavior of morphotropic phase boundary（MPB） in NaxK1-xNbO3 ceramics.Such MPB-like behavior contributes to the enhanced piezoelectric coefficient d33 of 122 pC/N, planar-mode electromechanical coupling coefficient kP of 28.6%, and dielectric constant εr of 703, respectively for the Na0.7K0.3NbO3 ceramic.Cubic temperature TC and the transitional temperature TO-T from orthorhombic to tetragonal phase are observed at around 420°C and 200°C, respectively. Lead-free piezoelectric NaxK1-xNbO3（x = 0.3-0.8）（NKN） ceramics were fabricated by normal sintering at 1060°C for 2 h.Microstructures and electrical properties of the ceramics were investigated with a special emphasis on the influence of Na content.The grain size of the produced dense ceramic was decreased by increasing Na content.A discontinuous change in the space distance was found at the composition close to Na0.7K0.3NbO3 ceramic, which indicates the presence of a transitional composition between two different orthorhombic phases, which is similar to the behavior of morphotropic phase boundary（MPB） in NaxK1-xNbO3 ceramics.Such MPB-like behavior contributes to the enhanced piezoelectric coefficient d33 of 122 pC/N, planar-mode electromechanical coupling coefficient kP of 28.6%, and dielectric constant εr of 703, respectively for the Na0.7K0.3NbO3 ceramic.Cubic temperature TC and the transitional temperature TO-T from orthorhombic to tetragonal phase are observed at around 420°C and 200°C, respectively.
作者 ZHANG Qian, ZHANG Boping, Li Haitao, and SHANG Pengpeng School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
出处 《Rare Metals》 SCIE EI CAS CSCD 2010年第2期220-225,共6页 稀有金属（英文版）
基金 supported by the National Natural Science Foundation of China (No. 50842028) the National Basic Research Priorities Program of China (No. 2007CB613301)
关键词 lead-free piezoelectric ceramics NKN sintering morphotropic phase boundary（MPB） lead-free piezoelectric ceramics NKN sintering morphotropic phase boundary（MPB）
分类号 TQ174.7 [化学工程—陶瓷工业]
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参考文献15

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同被引文献11

  • 1Thomas R. Shrout,Shujun J. Zhang.Lead-free piezoelectric ceramics: Alternatives for PZT?[J].Journal of Electroceramics.2007(1)
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  • 6ZHAO P,ZHANG B P,LI J F.Enhanced dielectric and piezoelectric properties in LiTaO3-doped lead-free(K,Na)NbO3ceramics by optimizing sintering temperature[].Scripta Materialia.2008
  • 7Urgen Rodel,etal.Perspective on the Development of Lead-free Piezoceramics[].Journal of the American Ceramic Society.2009
  • 8ZHAO Y,HUANG R.Effect of sinteringtemperature on microstructure and electric properties of0.95 (K0.5Na0.5)NbO3-0.05Li (Nb0.5Sb0.5)O3 with copper oxidesintering aid[].Journal of the American Ceramic Society.2011
  • 9Li Haitao,Zhang Boping,Zhang Qian,et al.Influence of sinteringtemperature on phase structure and electric properties of Mg-doped(Li,Na,K)NbO3 lead-free piezoelectric ceramics[].th IEEEInternational Symposium on Applications of Ferroelectrics.2009
  • 10PARK S J,PARK H Y,CHO K H,et al.Effect ofCuO on the sintering temperature and piezoelectricproperties of lead-free 0.95(Na0.5K0.5)NbO3-0.05CaTiO3ceramics[].Materials Research Bulletin.2008

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Rare Metals
2010年 第2期

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