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      https://www.ias.ac.in/article/fulltext/pram/050/03/0213-0220

    • Keywords

       

      β-Ni(OH)2; phase transition; infrared absorption; Raman study; high pressure

    • Abstract

       

      Infrared absorption and Raman study ofβ-Ni(OH)2 has been carried out up to 25 GPa and 33 GPa, respectively. The frequency ofA2u internal antisymmetric stretching O-H mode decreases linearly with pressure at a rate of −0.7 cm1/GPa. The FWHM of this mode increases continuously with pressure and reaches a value of ∼ 120 cm−1 around 25 GPa. There was no discernible change observed in the frequency and width of the symmetric stretchingA1g O-H Raman mode up to 33 GPa. The constancy of the Raman mode is taken as a signature of the repulsion produced by H-H contacts in this material under pressure. Lack of any discontinuity in these modes suggests that there is no phase transition in this material in the measured pressure range.

    • Author Affiliations

       

      Chitra Murli1 V Sugandhi1 2 Nandini Garg1 Surinder M Sharma1 S K Sikka1

      1. High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
      2. Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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