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SUMMARY:Quasicrystals as Templates for Aperiodic Films - Prof Renee Diehl\
 , Physics Department and Materials Research Institute\, Penn State Univers
 ity
DTSTART:20060224T091500Z
DTEND:20060224T101500Z
UID:TALK4789@talks.cam.ac.uk
CONTACT:Dr Ruben M Garnica
DESCRIPTION:Quasicrystals are new materials that are well ordered but not 
 periodic.  Their mechanical and electrical properties are very different f
 rom those of periodic crystals.  Recent progress in the characterization a
 nd preparation of quasicrystal surfaces raises new possibilities for their
  use as substrates and templates in the growth of films having novel struc
 tural\, electronic\, dynamic and mechanical properties. The apparently unu
 sual frictional properties of quasicrystals also evoke interesting fundame
 ntal questions about how physical properties are altered by quasiperiodici
 ty.\n\nOur focus for the past several years has been to study the growth o
 f films on quasicrystal surfaces\, with a view toward producing 1-componen
 t quasicrystal structures\, or quasiperiodically arranged nanostructures. 
  Metal films on quasicrystal surfaces have been found to grow in a variety
  of modes\, including the formation of quasiperiodic Cu multilayer structu
 res\, as starfish-like clusters of Al in quasiperiodic arrays\, and in hex
 agonal dendrite structures of Ag on icosahedral AlPdMn.  To obtain a more 
 fundamental understanding of the growth process\, we have recently studied
  and modeled the growth of Xe on decagonal AlNiCo.  This growth process in
 cludes the formation of a quasicrystalline first layer followed by a trans
 ition to an fcc(111) structure. \n\nThis talk will provide an introduction
  to many of the interesting features of quasicrystals and well as reviewin
 g the recent progress in the area of film growth on their surfaces. \n
LOCATION:U203\, Chemistry\, Department of
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