Dr James Cumby
We are interested in studying materials with functional properties including magnetism, electronic and ionic conductivity, and structural changes (such as negative thermal expansion). A particular area of interest is to synthesis materials combining multiple anions (such as oxide and fluoride) to tune physical properties.
Our research uses a combination of experimental synthesis and characterisation with computational methods. Structural analysis is a key theme to our work, using single crystal and powder diffraction of X-rays and neutrons to determine atomic structure, including total scattering analysis to study local structure. These data are collected in-house and at international facilities. Computational methods used include data-mining of crystallographic databases, and electronic structure modelling using density functional theory (DFT).
- Long range electronic phase separation in CaFe3O5,K.H. Hong, J. Cumby, A. Arevalo-Lopez, C. Ritter and J.P. Attfield, Nature Communications, 9, 2018, 2975.
- High Pressure synthesis, crystal growth and magnetic properties of TiOF, J. Cumby, M.B. Burchell and J.P. Attfield, Solid State Sciences, 80, 2018, 35-38.
- Charge order and negative thermal expansion in V2OPO4,E. Pachoud, J. Cumby, C. Lithgow and J.P. Attfield, Journal of the American Chemical Society, 140(2), 2018, 636-641.
- Ellipsoidal Analysis of Coordination Polyhedra, J. Cumby and J.P. Attfield, Nature Communications, 8, 2017, 14235.
- Synthetic analogues of Fe(II)-Fe(III) minerals containing a pentagonal ‘Cairo’ magnetic lattice, J. Cumby, R.D. Bayliss, F.J. Berry and C. Greaves, Dalton Transactions, 45, 2016, 11801.
- The structures and magnetic properties of FexCo1-xSb2O4 and MnxCo1-xSb2O4, 0<= x<= 1, J. Cumby, B.P. de Laune and C. Greaves, Journal of Materials Chemistry C, 4, 2016, 201.