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SUMMARY:Real Time Optical Probes of Phase Transitions in Nanoscale Materia
 ls  -  Dr  Akshay Rao\, Cavendish Laboratory\, Physics\, Cambridge
DTSTART:20211015T130000Z
DTEND:20211015T140000Z
UID:TALK161809@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Reversible and irreversible phase transitions are key to the o
 peration and eventual degradation of many nanoscale materials and devices.
   Operando imaging of such phase transitions at the nanoscale currently re
 quires sophisticated synchrotron X-ray or electron microscopy techniques\,
  which do not lend themselves to high-throughput material screening. In th
 is talk I will introduce our recent work to develop simple lab-based optic
 al scattering microscopies to track phase transitions under operating cond
 itions. For instance\, in the archetypal Li-ion battery cathode material L
 ixCoO2\, we visualize the insulator-to-metal\, solid solution and lithium 
 ordering phase transitions directly and determine rates of lithium diffusi
 on at the single-particle level\, identifying different mechanisms on char
 ge and discharge. We are also able to capture the dynamic formation of dom
 ain boundaries between different crystal orientations associated with the 
 monoclinic lattice distortion at the Li0.5CoO2 composition [1]. I will dis
 cuss how such methods might be applied to other systems such memristors an
 d bio-electronic circuits.\n\n[1]  “Operando optical tracking of single-
 particle ion dynamics and phase transitions in battery electrodes”\, Ali
 ce J. Merryweather\, Christoph Schnedermann\, Quentin Jacquet\, Clare P. G
 rey\, Akshay Rao\, Nature\, 594\, 522–528\, (2021).\n
LOCATION:CUED LR6
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