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SUMMARY:Structural (Dis)order As A Pathway To Functional Materials - Dr Si
 ân Dutton\, (University of Cambridge\, UK)
DTSTART:20190215T160000Z
DTEND:20190215T170000Z
UID:TALK122194@talks.cam.ac.uk
CONTACT:Dr Anna Ott
DESCRIPTION:I will present results on our work on developing high voltage\
 , high capacity cathodes for Mg-ion batteries and the emergent charges whi
 ch arise in Ising Kagome lattices. Divalent Mg-ion batteries offer an attr
 active alternative to Li-ion batteries due to the increased capacity offer
 ed by cycling a divalent cation and possibility of using a Mg metal anode.
  Despite demonstration of reversible cycling in the molybdenum sulphide ch
 evrel phase over 15 years ago[1]\, improvements have been slow and limitin
 g factors include the lack of a suitable electrolyte and challenges associ
 ated with intercalation of Mg2+ at high voltages and multiple electron red
 ox on an individual ions. I will present out results on pyro-\, MgxM2-xB2O
 5 and orthoborates\, MgxM3-x(BO3)2 M = Mn\,Fe\,Co\,Ni and discuss the role
  of disorder between Mg and M sites\, and the crystal structure on the obs
 erved electrochemical properties[2\,3]. I will then discuss the novel emer
 gent charge order in Ising Kagome magnets. These are predicted to show for
 mation of a number of exotic states on cooling\, which differ significantl
 y from their three-dimensional analogue\, spin-ice. I will show how 3:1 or
 dering in pyrochlores\, A3A.B3B.O14\, can be used to generate undistorted 
 Kagome lattices and present results on the Ising system Dy3Mg2Sb3O14. Bulk
  thermodynamic properties measurements\, diffuse scattering and monte-carl
 o simulations will be used to demonstrate the existence of emergent charge
 s below T* ~ 100 mK[4].\n\n1 Aurbach et al Nature\, 407\, 724 (2000)\n2 Gl
 ass et al. Chemistry of  Materials\, 29(7)\, 3118 (2017)\n3 Glass et al. i
 n preparation\n4 Paddison et al.  Nature Communications\, 7\, 13842 (2016)
  
LOCATION:Cambridge Graphene Centre Seminar Room
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