Nonstoichiometric (K, Na)NbO3 ceramics: Densification and electrical properties

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• 作者：Limei Zheng (1)
  Jinfeng Wang (2)
  
• 关键词：Lead ; free ceramics ; (K ; Na)NbO3 ; Densification ; Piezoelectric properties
• 刊名：Journal of Electroceramics
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：32
• 期：2-3
• 页码：192-198
• 全文大小：999 KB
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• 作者单位：Limei Zheng (1)
  Jinfeng Wang (2)
  
  1. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, 150001, China
  2. Shool of Physics, Shandong University, Jinan, 250100, China
  
• ISSN：1573-8663

文摘

In order to clarify the influence of excess ions in A or B sites on perovskite (K,Na)NbO3 ceramics, various compositions of (K0.48Na0.52)Nb1+x%O3 (ABO3) ceramics where x is in the range of ±1?% were prepared by conventional solid state method and their densification, structure, dielectric and piezoelectric properties were investigated. Results showed that a small amount of excess A-site ions could compensate for the deficiency of K and Na ions in A-sites caused by volatilization resulting in good piezoelectric properties. The ceramics with x-??0.1 exhibited optimum piezoelectric properties with d 33--27pC/N and k p--.41. However, presence of too much alkali elements (x-??0.5) led to deterioration of density, dielectric and piezoelectric properties, although the crystal structure was not changed. The electrical properties, on the other hand, were not sensitive to the B-site excess ions. These results are expected to be very useful for further designing of (K,Na)NbO3-based ceramics as lead-free alternatives to piezoelectric materials.