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SUMMARY:Structural hierarchies and phase transitions in perovskites: Group
   theoretical constraints and practical applications - Christopher Howard\
 , School of Engineering\, University of Newcastle\, Australia
DTSTART:20090604T150000Z
DTEND:20090604T160000Z
UID:TALK17134@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:The application of group theoretical methods to the study of p
 hase transitions has been greatly facilitated by the implementation of the
 se methods in computer programs such as ISOTROPY. Structures arising from 
 the application of any specified distortion (irrep) or combination of dist
 ortions to a given parent structure can be listed\, group-subgroup relatio
 nships established\, and the nature of the transitions that might occur be
 tween the different structures assessed.\nThe methods have been applied to
  establish structural hierarchies for perovskites\, which in turn have pro
 ved invaluable in assisting experimental investigations. The methodology w
 ill be illustrated by reference to diffraction studies of the temperature-
 induced phase transitions in SrZrO3\, the discovery of a new high temperat
 ure phase in WO3\, and elucidation of the temperature-composition phase di
 agram for (Ca\,Sr)TiO3. More recent applications will also be presented.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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