Metastable phase formation of Pt–X (X = Ir, Au) thin films

Saksena, Aparna; Chien, Yu Chuan; Chang, K.; Kümmerl, Pauline; Hans, Marcus; Völker, Bernhard; Schneider, Jochen Michael

doi:10.1038/s41598-018-28452-4

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Metastable phase formation of Pt–X (X = Ir, Au) thin films

MPS-Authors

/persons/resource/persons44227

Chang, K.
Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Materials Chemistry, RWTH Aachen University, Aachen, Germany; Engineering Laboratory of Nuclear Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, China; Max Planck Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, Düsseldorf, Germany;

/persons/resource/persons137975

Völker, Bernhard
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Materials Chemistry, RWTH Aachen University, Aachen, Germany;

/persons/resource/persons136867

Schneider, Jochen Michael
Materials Chemistry, Lehrstuhl für Werkstoffchemie, RWTH Aachen, Germany;
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Saksena, A., Chien, Y. C., Chang, K., Kümmerl, P., Hans, M., Völker, B., et al. (2018). Metastable phase formation of Pt–X (X = Ir, Au) thin films. Scientific Reports, 8(1): 10198. doi:10.1038/s41598-018-28452-4.

Cite as: https://hdl.handle.net/21.11116/0000-0001-E69B-D

Abstract

The dependence of phase formation and mechanical properties on the chemical composition has been investigated for Pt-Ir and Pt-Au combinatorial thin films. The formation of a single, metastable Pt-Ir solid solution has been observed for all experimental compositions and temperatures. Upon Ir addition to Pt the experimentally determined changes in lattice parameter and Young's modulus display rule of mixture behavior which is in good agreement with our ab initio data. Whereas, in the Pt-Au system, the single metastable solid solution decomposes into two phases as the growth temperature is raised to ≥600 °C. The lattice parameters in the dual phase region are independent of chemical composition. The substrate temperature and chemical composition dependent phase formation in Pt-Ir and Pt-Au thin films can be rationalized based on CALPHAD (CALculation of PHAse Diagrams) results combined with estimations of the activation energy required for surface diffusion: The metastable phase formation during film growth is caused by kinetic limitations, where Ir atoms (in Pt-Ir) need to overcome an up to factor 6 higher activation energy barrier than Au (in Pt-Au) to enable surface diffusion. © 2018 The Author(s).