Lin Yuanhua

Multiferroic behaviour of epitaxial NiFe2O4–BaTiO3 heterostructures

Multiferroic NiFe2O4 (NFO)-BaTiO3 (BTO) bilayered thin films are epitaxially grown on (001) Nb-doped SrTiO3 (STO) substrates by pulsed-laser deposition (PLD). Different growth sequences of NFO and BTO on the substrate yield two kinds of epitaxial heterostructures with (001)-orientation, i.e. (001)-NFO/(001)-BTO/substrate and (001)-BTO/(001)-NFO/substrate. Microstructure studies from x-ray diffraction (XRD) and electron microscopies show differences between these two heterostructures, which result in different multiferroic behaviours. The heterostructured composite films exhibit good coexistence of both ferroelectric and ferromagnetic properties, in particular, obvious mag-netoelectric (ME) effect on coupling response.

Effects of Li3PO4 Particles on Electrical Property in Li0.5La0.5TiO3/Li3PO4 Composite Solid Electrolyte

Abstract The ionic conductivity of Li 3 PO 4 dispersed Li 0.5 La 0.5 TiO 3 (LLTO) composite solid electrolyte was examined by complex impedance analysis. The X-ray powder diffraction (XRD), scanning electron microscope (SEM) observation and relative density measurement were also performed to study the dispersion of the second phase into the LLTO electrolyte. Results indicate that the addition of Li 3 PO 4 into LLTO matrix decreases the ionic conductivity, though the composites added by the Li 3 PO 4 particles show a high compactness. The reasons for the conductivity deterioration were clarified based on the lattice structure of LLTO, microstructures at the grain boundary regions, and the lithium content. The variation of the lithium content and microstructures in the LLTO matrix dispersed by Li 3 PO 4 particles are mostly responsible for the behaviors in the ionic conduction.