Size Induced Structural Transitions

• Novel hexagonal polytypes of Silver: Growth, characterization and first principles calculations.
  I Chakraborty, D Carvalho, S Shirodkar, S Lahiri, S Bhattacharyya, R Banerjee, U Waghmare and P Ayyub.
  J. Physics: Condensed Matter 23 (2011) 325401
• Lattice expansion in nanocrystalline Niobium thin films.
  R Banerjee, E. A. Sperling, G B Thompson, S. Bose, P. Ayyub and H L Fraser.
  Applied Physics Letters 82 (2003) 4250
• Observation of a hexagonal (4H) phase in nanocrystalline silver.
  P Taneja, R Banerjee, P Ayyub, R Chandra and G K Dey.
  Physical Review B 64 (2001) 033405
• Effect of the size-induced structural transformation on the band gap in CdS nanoparticles.
  R Banerjee, R Jayakrishnan and P Ayyub.
  J. Physics: Condensed Matter 12 (2000) 10647
• Theory of size induced phase transitions in displacive ferroelectrics.
  K Sheshadri, R Lahiri, P Ayyub and S Bhattacharya.
  J. Physics: Condensed Matter 11 (1999) 2459
• Electronic structure of the 4H-polytype of diamond .
  A K Sharma, H G Salunke, G P Das, P Ayyub and M S Multani.
  J. Physics: Condensed Matter 8 (1996) 5801
• Size-induced structural transition in the Cu-O and Ce-O systems.
  V R Palkar, P Ayyub, S Chattopadhyay and M S Multani.
  Physical Review B 53 (1996) 2167
• Size-induced diffuse phase transition in nanocrystalline ferroelectric PbTiO3 .
  S Chattopadhyay, P Ayyub, V R Palkar and M S Multani.
  Physical Review B 52 (1995) 13177
• The effect of crystal size reduction on lattice symmetry and cooperative properties.
  P Ayyub, V R Palkar, S Chattopadhyay and M S Multani.
  Physical Review B 51 (1995) 6135
• Size-induced structural phase transitions and hyperfine properties of microcrystalline Fe2O3.
  P Ayyub, M S Multani, M Barma, V R Palkar and R Vijayaraghavan.
  J. Physics C: Solid State Physics 21 (1988) 2229

Atomic Clusters

• H-substituted anionic Carbon clusters CnH^- (n<=10): Ab initio studies and experimental observations.
  L Pan, B K Rao, A K Gupta, G P Das and P Ayyub.
  J. Chemical Physics 119 (2003) 7705
• Formation of Nitrogen-substituted Carbon cluster anions by gas-feed Cs-sputtering from different forms of Carbon.
  A K Gupta and P Ayyub.
  European Physical Journal D 17 (2001) 221