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Divacancy superstructures and enhanced thermopower in NaxCayCoO2
Replacing Na ions in NaxCoO2 with divalent Ca ions results in the formation of ordered arrays of divacancy clusters, rather than the trivacancy clusters found for the pure... -
Application of Superpace methods to long period Perovskite superstructures
Recently there have been considerable several reports of ¿nanostructured¿ perovskite oxides. In order to obtain detailed knowledge of the factors controlling the formation of... -
Determination of high shear superstructures in poly (ethylene oxide)/silica d...
High shear in paints and emulsion is common during both processing and application. Spray coating, films rolling and mixing all contaain high shear states. We are interested in... -
High temperature superstructures in thermoelectric oxides
Sodium cobalate has emerged as one of the best thermoelectric materials. Our previous neutron Laue diffraction studies on SXD have found ordered arrays of multivacancy clusters,... -
Influence of superstructures on rich transport properties of lithium cobaltate
In the vicinity of x ~ 0.75, LixCoO2 has potential as a thermoelectric, since it has a high Seebeck coefficient and metallic conductivity. We have performed the first successful... -
Single-crystal neutron diffraction studies of chain-ordered brownmillerite su...
We are performing structural investigations of a series of brownmillerites (Sr,Ca)2(Fe,Co)2O5 which display long-range modulated ordering of oxygen vacancies at ambient and high...
