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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E69B-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E69D-B
Genre: Journal Article

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Saksena, Aparna1, Author              
Chien, Yu Chuan1, Author              
Chang, K.2, 3, Author              
Kümmerl, Pauline1, Author              
Hans, Marcus4, Author              
Völker, Bernhard5, 6, Author              
Schneider, Jochen Michael7, 8, Author              
Affiliations:
1Materials Chemistry, RWTH Aachen University, Aachen, Germany, persistent22              
2Algorithms and Complexity, MPI for Informatics, Max Planck Society, ou_24019              
3Materials 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, ou_persistent22              
4Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, Aachen, Germany, ou_persistent22              
5Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
6Materials Chemistry, RWTH Aachen University, Aachen, Germany, ou_persistent22              
7Materials Chemistry, Lehrstuhl für Werkstoffchemie, RWTH Aachen, Germany, ou_persistent22              
8Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              

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 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).

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Language(s): eng - English
 Dates: 2018-12-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41598-018-28452-4
BibTex Citekey: Saksena2018
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 8 (1) Sequence Number: 10198 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: /journals/resource/2045-2322