Electroceramics XIII
June, 24th-27th 2012
University of Twente, Enschede,
The Netherlands
122
References
[1] M. W. Barsoum, Program on Solid State Chemistry, vol 28, page 201, 2000 [2] M. Barsoum, American Society for Ceramic, vol 89, page 334, 2001
P.56
Growth simulations of pulsed laser deposition on mixed terminated oxide surfaces
Bouwe Kuiper, Guus Rijnders, Dave Blank, Gertjan Koster,
Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, Enschede, Netherlands
Complex oxide heterostructures have attracted a lot of interest recently, while they can be prepared with atomic precision. Using Pulsed Laser Deposition (PLD), one can essentially build artificial crystal structures bottom up, for example, by the depositing heterostructures, where either A, B or both cations are periodically varied in an ABO3
crystal structure. These heterostructure consisting of alternating sheets of material, are typically grown on singly terminated substrates; TiO2 terminated SrTiO3 or ScO2
terminated DyScO3. Surfaces of the mixed variant, showing ordered areas of both AO and
BO2 surface termination, are shown in literature to be templates for nanostructed PLD
growth of epitaxial SrRuO3 thin film structures of several nanometers in height.
Here we study this growth mechanism, which drives the formation of the epitaxial nanostructures, by employing a kinetic Monte Carlo model. A mixed terminated substrate is simulated by locally adjusting the activation energy for diffusion. Unit cell blocks are allowed to hop on a three dimensional grid, where there hopping probability depends on the number and type of neighboring cells. SrRuO3 is known to be able to grow in a
step-flow-like growth mode. Here we show that this high SrRuO3 diffusivity will lead to an
enhanced sensitivity to different surface areas. Furthermore the model is used to study and tune the evolution of a variation of different kinetically derived nanostructures.
P.57
Synthesis and characterisation of BiFeO3nanoparticles
Marianela Escobar Castillo, Qingji Kong, Vladimir Shvartsman, Doru C. Lupascu Institute for Materials Science, University of Duisburg-Essen, Essen, Germany
The room temperature multiferroic material bismuth ferrite (BiFeO3) has attracted a great
deal of attention due to the fascinating fundamental physics and potential application for novel magnetoelectric devices. Furthermore, BiFeO3 can be used as photocatalytic
material due to its small band-gap. BiFeO3 shows antiferromagnetic (TN≈370°C) and
ferroelectric (Tc ≈830°C) ordering and coupling between the two ferroics properties.
We report the synthesis and charakterisation of BiFeO3 nanoparticles and the
investigation of its magnetic and dielectric properties. Single phase material with the rhombohedral perowskite structure was synthesized via a wet chemical route using bismuth nitrate and iron nitrate as starting materials. The composition and the structure of the BiFeO3 nanopowders have been investigated by powder X-ray diffraction, DSC/ TG
and scanning electron microscopy (SEM). Magnetic property tests of the nanoparticles will be shown.
