Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Structural, Dielectric and Field-Induced Strain Properties of La-Modified Bi1/2Na1/2TiO3-BaTiO3-SrZrO3 Ceramics

  • Hussain, Ali (School of Advanced Material Engineering, Changwon National University) ;
  • Maqbool, Adnan (School of Advanced Material Engineering, Changwon National University) ;
  • Malik, Rizwan Ahmed (School of Advanced Material Engineering, Changwon National University) ;
  • Zaman, Arif (School of Advanced Material Engineering, Changwon National University) ;
  • Lee, Jae Hong (School of Advanced Material Engineering, Changwon National University) ;
  • Song, Tae Kwon (School of Advanced Material Engineering, Changwon National University) ;
  • Lee, Jae Hyun (School of Advanced Material Engineering, Changwon National University) ;
  • Kim, Won Jeong (Department of Physics, Changwon National University) ;
  • Kim, Myong Ho (School of Advanced Material Engineering, Changwon National University)
  • Received : 2015.07.27
  • Accepted : 2015.09.08
  • Published : 2015.10.27
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Abstract

$Bi_{0.5}Na_{0.5}TiO_3$ (BNT) based ceramics are considered potential lead-free alternatives for $Pb(Zr,Ti)O_3$(PZT) based ceramics in various applications such as sensors, actuators and transducers. However, BNT-based ceramics have lower electromechanical performance as compared with PZT based ceramics. Therefore, in this work, lead-free bulk $0.99[(Bi_{0.5}Na_{0.5})_{0.935}Ba_{0.065}]_{(1-x)}La_xTiO_3-0.01SrZO_3$ (BNBTLax-SZ, with x = 0, 0.01, 0.02) ceramics were synthesized by a conventional solid state reaction The crystal structure, dielectric response, degree of diffuseness and electric-field-induced strain properties were investigated as a function of different La concentrations. All samples were crystallized into a single phase perovskite structure. The temperature dependent dielectric response of La-modified BNBT-SZ ceramics showed lower dielectric response and improved field-induced strain response. The field induced strain increased from 0.17%_for pure BNBT-SZ to 0.38 % for 1 mol.% La-modified BNBT-SZ ceramics at an applied electric field of 6 kV/mm. These results show that La-modified BNBT-SZ ceramic system is expected to be a new candidate material for lead-free electronic devices.

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References

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