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SUMMARY:Selective synthesis through the control of point defects in solid s
 tate reactions
LOCATION:Chemistry, A101
TZID:America/Denver
DTSTART:20220422T160000
UID:2026-04-24-21-04-14@natsci.colostate.edu
DTSTAMP:20260424T210414
Description:About the Seminar:\n\nSolid-state synthesis is a popular method
  to explore and produce new functional materials. However\, selectively sy
 nthesizing a product in solid-state is difficult because the target phase 
 is competing with other chemical composition that are equally or more stab
 le. The key is to selectively form intermediates that direct a reaction to
 wards one product phase over another. Therefore\, understanding why certai
 n intermediates form over others is imperative to achieve selective synthe
 ses of functional materials. Double displacement reactions\, or metathesis
 \, provide opportunities to study the effects of precursor configurations 
 on the intermediate formation and reaction pathway. This talk will focus o
 n the effect of different structural configurations of lanthanum oxyhalide
 s with similar chemical compositions in the metathesis reaction LiMnO2 + L
 aOX → LaMnO3\, where X=Cl and Br. Depending on the presence of halide an
 ions\, the metathesis forms different point defected intermediates that le
 ad to oxidized or reduced off-stoichiometries of LaMnO3. From synchrotron 
 X-ray diffraction analysis\, I determined the point defects that are respo
 nsible for the observed reaction pathway. Not only do defects mediate the 
 progression of a solid-state reaction\, point defects affect the performan
 ce of materials in devices. Knowledge on the formation of point defects is
  highly sought after in defect engineering of new functional materials\, e
 specially for devices which contain non-equilibrium materials. 4:00 pm
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