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    • Dielectric dispersion and piezoelectric resonance in benzil single crystals grown by Bridgman-Stockbarger technique

      M V Shankar K B R Varma

      Volume 19 Issue 5 October 1996 pp 791-798

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      https://www.ias.ac.in/article/fulltext/boms/019/05/0791-0798

    • Keywords

       

      Benzil; dielectric dispersion; piezoelectric resonance

    • Abstract

       

      Large single crystals of an organic nonlinear optical (NLO) material, benzil, have been grown by employing an indigenously built Bridgman-Stockbarger crystal grwoth system. The dielectric constant (εr), dielectric loss tangent (tanδ) and impedance (Z) of these crystals, monitored along the crystallographica-axis, as a function of frequency in the 100kHz-10MHz range, exhibit sharp resonance effects in the 100–300kHz region. These strong resonance effects are attributed to the piezoelectric nature of the crystal. The origin of the appearance of the sharp peaks in the frequency variation ofεr and tanδ is in response to the elastic resonances induced via the externally applied electric field. The resonance peak positions shift towards lower frequencies with increase in temperature as a consequence of the decrease in the stiffness coefficient (C11) of the crystal.

    • Author Affiliations

       

      M V Shankar1 K B R Varma1

      1. Materials Research Centre, Indian Institute of Science, Bangalore - 560 012, India

    • Dates

       
      Published
      October 1996
      Manuscript received
      26 June 1996
      Manuscript revised
      29 July 1996

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