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SUMMARY:Bulk diffusion in alumina: solving the corundum conundrum - Nick H
 ine (TCM)
DTSTART:20090603T100000Z
DTEND:20090603T104000Z
UID:TALK15860@talks.cam.ac.uk
CONTACT:Neil Drummond
DESCRIPTION:I will present _ab initio_ determinations of diffusion coeffic
 ients for native defects in alumina (Al2O3)\, which provide resolution to 
 long-standing questions about the nature of transport in corundum-structur
 e materials. I will demonstrate the important role played by aliovalent im
 purity dopants\, which act to "buffer" concentrations of native defects th
 rough the formation of clusters of native defects and substitutional impur
 ities\, explaining the remarkably small changes in bulk diffusion constant
 s upon aliovalent doping.\n\n"Download slides":http://www.tcm.phy.cam.ac.u
 k/~ndd21/ESDG_slides/hine030609.pdf (PDF)
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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