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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 3: 469 - 473

DOI: https://doi.org/10.3724/SP.J.1077.2007.00469

Research Paper

Mn-modified (K 0.5 Na 0.5 ) 0.96 Sr 0.02 NbO3 Lead-free Piezoelectric Ceramics

  • LIU Tao ,
  • DING Ai-Li ,
  • HE Xi-Yun ,
  • ZHENG Xin-Sen ,
  • QIU Ping-Sun ,
  • CHENG Wen-Xiu
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  • State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received date: 2006-07-05

  Revised date: 2006-09-26

  Online published: 2007-05-20

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Abstract

Dense lead free ceramics of (K 0.5 Na 0.5 ) 0.96 Sr 0.02 Nb 1-x Mn x O 3 (x=0,0.01,0.02,0.03,0.04) were successfully prepared by a conventional mixed oxide method. The X-ray diffraction patterns revealed pure peroveskite structure after Mn doping as compared to the original composition. This was attributed to the inhibition of K+ volatility during sintering process. Dielectric anomaly was observed and explained by multiple-cell structure resulting from Mn-induced lattice distortion. Low loss tangent and relatively high planar electromechanical coupling factor were obtained at x=0.02. The main parameters for the composition of x=0.02 are: εT33/ε0=479, d33=121pC/N Kp=41%, Qm=298, tanδ=1.6%, Tc=391℃. The rates of resonant frequency variation, αfr, and planar coupling factor variation, αKp, with temperature are --1.85% and 1.19% at 80℃, respectively. This material may be suitable for applications in ultrasonic transducers.

Key words： lead free; piezoelectric ceramics; dielectric; transducer

Cite this article

LIU Tao , DING Ai-Li , HE Xi-Yun , ZHENG Xin-Sen , QIU Ping-Sun , CHENG Wen-Xiu . Mn-modified (K 0.5 Na 0.5 ) 0.96 Sr 0.02 NbO3 Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2007 , 22(3) : 469 -473 . DOI: 10.3724/SP.J.1077.2007.00469

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