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SUMMARY:Enhancing materials design using microscopy and modelling - Dr Reb
 ecca Nicholls\, University of Oxford
DTSTART:20190228T141500Z
DTEND:20190228T151500Z
UID:TALK108910@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:Electron energy loss spectroscopy (EELS) carried out inside a 
 scanning transmission electron microscope (STEM) provides a probe of eleme
 ntal composition and bonding with atomic resolution.  It allows us to map 
 the local chemistry of a material.  STEM EELS can tackle a wide variety of
  materials problems and has been used to identify single atoms\, determine
  crystal phases\, map dopants at grain boundaries and visualise plasmon mo
 des. Combining experimental EELS with modelling can play an invaluable rol
 e in both the interpretation of experimental data and the design of experi
 ments.  Crucially\, it can allow us to solve problems which experiment or 
 modelling alone cannot.  I will give examples including counting nitrogen-
 vacancies in nanodiamond [1] and using a combination of first principles s
 tructure prediction\, EELS and diffraction to solve the structure of an un
 known crystal phase at the interface of a metal and an oxide [2].  I will 
 also talk about the latest developments which now mean it is possible to d
 etect phonons and carry out momentum resolved vibrational mode measurement
 s with nm spatial resolution [3].    \n\n[1]     SLY Chang et al.\, Nanosc
 ale 8 (2016) 10548-10552\n[2]     RJ Nicholls et al.\, Adv Eng Mater 17 (2
 015) 211-215\n[3]     FS Hage et al.\, Science Adv\, accepted\; RJ Nicholl
 s et al.\, PRB accepted\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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