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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/020/04/0535-0540

    • Keywords

       

      Quasicrystal; icosahedral phase; Mössbauer spectroscopy; positron annihilation; phasons

    • Abstract

       

      Al61·4Cu22·7Fe15·9, Al63·2Cu21·8Fe15 and Al71Cu14Fe15 have been studied by Mössbauer, positron annihilation and X-ray diffraction techniques. The positron lifetime, measured as a function of temperature, in Al61·4Cu22·7Fe15·9 shows a two-step increase. This is found to be due to the dynamics of phasons associated with Al and Cu, having activation energies of 0·43 eV and 0·78 eV respectively. In the case of Al71Cu14Fe15, a phase transformation from the quasicrystalline-crystalline phase at ≈ 550°C is observed.

    • Author Affiliations

       

      C M Chittaranjan1 T N Sairam1 K P Gopinathan1 C S Sundar1

      1. Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, India

    • Dates

       
      Published
      July 1997

  • Bulletin of Materials Science | News

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

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