Anisotropic nano-plate structures in self-assembled perovskite-spinel thin films, BiFeO3-NiFe2O4 and BiFeO3-CoFe2O4, which were deposited on (001)c SrRuO3/SrTiO3 and DyScO3 substrates, respectively, have been demonstrated using transmission electron microscopy combined with strain analysis. Unlike the unitary cube-on-cube orientation relationship reported widely, the growth direction of the CoF...

In this paper, we present the main irradiation effects observed on ferrites in the world between 1970 and 195. The crystallographic and magnetic changes induced by irradiation are shown for carious kinds of particles : fast neutrons, low energy ions and high energy heavy ions and for different ferrite structures : spinels, garnets and hexaferrites.The observed effects depend both on the mechani...

We discuss how two techniques, based on (1) lattice dynamics (lattice statics) simulations and (2) Monte Carlo methods may be used to calculate the thermodynamic properties of solid solutions and highly disordered systems. The lattice dynamics calculations involve a full free-energy structural optimisation of each of a number of configurations, followed by thermodynamic averaging. The Monte Car...

We consider the effects of local impurities in highly frustrated diamond-lattice antiferromagnets, which exhibit large but nonextensive ground-state degeneracies. Such models are appropriate to many A-site magnetic spinels. We argue very generally that sufficiently dilute impurities induce an ordered magnetic ground state and provide a mechanism of degeneracy breaking. The states that are selec...

In order to improve the cycling performance of LiMn2O4, the spinel phase LiMn2–xBaxO4 (x = 0.01, 0.02 and 0.05) compounds were fabricated by the glycine-nitrate method. The structures of the products were investigated by X-ray diffraction. Electrochemical studies were carried out using the Li|LiMn2O4 and Li|LiMn2–xBaxO4 cells. The capacity loss of Li|LiMn2O4 cell is about 15% after 30 cycles, w...

Copper nanoparticles with a mean carbon coating of about 1 nm were continuously produced at up to 10 g h(-1) using a modified flame spray synthesis unit under highly reducing conditions. Raman spectroscopy and solid state (13)C magic angle spinning nuclear magnetic resonance spectroscopy revealed that the thin carbon layer consisted of a sp(2)-hybridized carbon modification in the form of graph...