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BEGIN:VEVENT
DTSTAMP:20260704T032247Z
DTSTART;VALUE=DATE-TIME:20070131T163000
DTEND;VALUE=DATE-TIME:20070131T173000
SUMMARY:Departmental Colloquium - The Structure of Disordered Materials: 
 Neutron Total Scattering Studies
TZID:Europe/London
UID:20070131-NE100000022848_ITEM@warwick.ac.uk
CREATED:20061023T095200Z
DESCRIPTION:Disorder in materials can range from the complete lack of lon
 g-range order in glasses\, to the non-periodic displacement or misplacem
 ent of atoms in disordered crystals. Glasses and other amorphous materia
 ls\, however\, do possess short range order\, and this can be characteri
 sed by an atom-atom pair correlation function\, derived experimentally b
 y Fourier transformation of the diffraction pattern over its full range 
 – hence the term ‘total scattering’. For disordered crystalline material
 s the unit cells are not all identical and hence\, although they exhibit
  Bragg diffraction\, they have structural properties which are not revea
 led by conventional crystallographic methods. Thus it is becoming increa
 singly common to apply the pair correlation function method to crystals\
 , as well as glasses. By these means it can be shown that the local stru
 cture (short range order) may differ from the long range structure deter
 mined solely from the Bragg diffraction peaks. The recently constructed 
 GEneral Materials diffractometer\, GEM\, at the ISIS neutron source is t
 he most advanced neutron diffractometer for total scattering studies in 
 the world. The talk will discuss the study of the structure of disordere
 d materials by neutron total scattering\, using results from GEM as exam
 ples. These include: - The evolution of 5-coordinated Ge as an explanati
 on of the germanate anomaly in glasses\, - magnetic differences for find
 ing ions in glasses\, - rings in borate glasses\, - skipping ropes made 
 from cyanides\, - the search for oxo groups in a uranium oxide. (See htt
 p://www.amorphousstructure.sgthome.co.uk/06esg/index.html for a tutorial
  on “Neutron diffraction as a probe of local structure”)
LOCATION:Prof. Alex Hannon\, ISIS\, Rutherford Appleton Laboratory - PLT
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20070820T105558Z
ORGANIZER;CN=Oleg Petrenko:
END:VEVENT
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