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- C M Chittaranjan
  
  Articles written in Bulletin of Materials Science
- Volume 20 Issue 4 July 1997 pp 535-540
  
  ⁵⁷Fe Mössbauer and positron lifetime studies of Al-Cu-Fe quasicrystals
  
  C M Chittaranjan T N Sairam K P Gopinathan C S Sundar
  
  More Details Abstract Fulltext PDF
  
  Al_61·4Cu_22·7Fe_15·9, Al_63·2Cu_21·8Fe₁₅ and Al₇₁Cu₁₄Fe₁₅ have been studied by Mössbauer, positron annihilation and X-ray diffraction techniques. The positron lifetime, measured as a function of temperature, in Al_61·4Cu_22·7Fe_15·9 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.

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