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    • Keywords


      PLZT; MPB; vector impedance spectroscopy; electromechanical parameters.

    • Abstract


      The compositions of lead lanthanum zirconate titanate PLZT [Pb(Zr0.57Ti0.43)O3 + 𝑥 at% of La, where 𝑥 = 3, 5, 6, 10 and 12] have been synthesized using mixed oxide route. The temperature dependent electromechanical parameters have been determined using vector impedance spectroscopy (VIS). The charge constant 𝑑31 and elastic compliance $s^{E}_{11}$ show a peak in all the samples at a temperature 𝑇mt much below the ferroelectric – paraelectric transition temperature, whereas the series resonance frequency 𝑓s shows a dip at these temperatures. The Poisson’s ratio 𝜎𝐸 increases with temperature 𝑇 showing a broad peak at a temperature higher than 𝑇mt. The voltage constant 𝑔31 decreases and the planar coupling coefficient 𝐾p remains constant up to half of the 𝑇mt and then falls sharply with 𝑇. Half of the 𝑇mt can, therefore, be used for specifying the working temperature limit of the piezoceramics for the device applications.

    • Author Affiliations


      A K Shukla1 2 V K Agrawal1 I M L Das1 Janardan Singh3 S L Srivastava1

      1. Department of Physics, University of Allahabad, Allahabad 211 002, India
      2. Presently at Department of Physics, Amity School of Engineering & Technology, Amity University, Sec. 125, Noida, G. B. Nagar, UP, India
      3. National Physical Laboratory, Dr K S Krishnan Road, New Delhi 110 012, India
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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