Month: October 2016

Ultrafast Epitaxial Growth Kinetics in Functional Oxide Thin Films Grown by Pulsed Laser Annealing of Chemical Solutions

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Albert Queraltó*Angel Pérez del PinoMaría de la MataJordi ArbiolMar TristanyXavier Obradors, and Teresa Puig; Chem. Mater., 2016, 28 (17), pp 6136–6145. DOI: 10.1021/acs.chemmater.6b01968

The crystallization process and physical properties of different functional oxide thin films (Ce0.9Zr0.1O2-y, LaNiO3, Ba0.8Sr0.2TiO3, and La0.7Sr0.3MnO3) on single crystal substrates (Y2O3:ZrO2, LaAlO3, and SrTiO3) are studied by pulsed laser annealing (PLA). A Nd:YAG laser source (λ = 266 nm, 10 Hz and τ ∼ 3 ns) is employed to crystallize chemical solution deposited (CSD) amorphous/nanocrystalline films under atmospheric conditions. We provide new insight on the influence of photochemical and photothermal interactions on the epitaxial crystallization kinetics of oxide thin films during the transformation from amorphous/polycrystalline material (i.e., atomic diffusion, epitaxial growth rates, and activation energies of nucleation and crystallization). The epitaxial growth is investigated by varying the laser fluence and the applied number of pulses. The morphology, structure, and epitaxial evolution of films are evaluated by means of atomic force and transmission electron microscopies and X-ray diffraction. Highly epitaxial oriented films of 20–40 nm in thickness are obtained by PLA. The crystallization kinetics of laser treatments is determined to be orders of magnitude faster than thermal treatments with similar activation energies (1.5–4.1 eV), mainly due to the large temperature gradients inducing modified atomic diffusion mechanisms derived mainly from photothermal interactions, as well as a minor contribution of photochemical effects. The fast heating rates achieved by PLA also contribute to the fast epitaxial growth due to reduced coarsening of polycrystalline material. The measurement of the physical properties (electrical resistivity and magnetism) of laser processed CSD films has revealed significantly good functionalities, close to those of thermally grown films, but with much shorter processing times.

Welcome to Pengmei Yu!

pengmeiyu

¡Hola todos, Soy Pengmei Yu de China, y un placer conoceros!

My background is light chemical engineering, and I’ll be working here for my PhD degree for the next 4 years, under the supervision of Dr. Mariona Coll.

In my spare time, I like to do some readings, listening to music, playing badminton and hiking.

Summer 2016: Ferran Vallès’ stay at ASC (Tallahassee, USA)

collage

The PhD candidate Ferran Vallès has been visiting the Applied Superconductivity Center (ASC) in Tallahassee (Florida, USA) from the 3rd of August until the 5th of October under the supervision of Jan Jaroszynski, Dmytro Abraimov, Chiara Tarantini and David Larbalestier. During his stay, he has been able to evaluate CSD YBCO nanocomposites at very high magnetic fields and has had the opportunity to perform experiments up to 35T in a DC magnet in the National High Magnetic Field Laboratory (NHMFL), also located in the same campus.

4-6th October 2016: 48M EUROTAPES Meeting at Karlsruhe

The 48M consortium meeting of EUROTAPES has been taken place on the 4th-6th of October in Karlsruhe (Germany) hosted by the KIT (Karlruhe Insititute of Technology).

Participants have discussed scientific activities such as high througput, scaling and nanocomposites but also quality control and life cycle approach of the project.

From ICMAB: X. Obradors (EUROTAPES’ coordinator), T. Puig, S. Ricart, A. Palau, M. Tristany, C. Pop, B. Mundet, Z. Li have been participated.

Eurotapes Group Photo

IFW Dresden Leibniz Medal price to Prof. Xavier Obradors

IFW Dresden

IFW Dresden Leibniz Medal price to Prof. Xavier Obradors for his task as a Scientific Advisory Board of this institution.

This price, that was also award to other members of this organization, was presented during the last SAB meeting, the 10 -11 th October.

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In the picture (from left to right): Prof. Philippe M. Fauchet, Vanderbilt Univ., Prof. Eberhard Umbach, KIT, Prof. Xavier Obradors Berenguer, ICMAB-CSIC, Prof. Alan Lindsay Greer, Univ. of Cambridge.leibniz-medal

 

Institut de Ciència de Materials de Barcelona ICMAB CSIC

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