Decomposition of CrN induced by laser-assisted atom probe tomography

Helene Waldl, Marcus Hans, Maximilian Schiester, D. Primetzhofer, Michael Burtscher, Nina Schalk, Michael Tkadletz

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


It is known that measurement parameters can significantly influence the elemental composition determined by atom probe tomography (APT). Especially results obtained by laser-assisted APT show a strong effect of the laser pulse energy on the apparent elemental composition. Within this study laser-assisted APT experiments were performed on Cr 0.51N 0.49 and thermally more stable (Cr 0.47Al 0.53) 0.49N 0.51, comparing two different base temperatures (i.e. 15 and 60 K), laser wavelengths (i.e. 532 and 355 nm) and systematically modified laser pulse energies. Absolute chemical compositions from laser-assisted APT were compared to data obtained from ion beam analysis. The deduced elemental composition of CrN exhibited a strong increase of the Cr content when the laser pulse energy was increased for both laser wavelengths. For low laser pulse energies Cr, CrN, N and N 2 ions were identified, while the amount of detected Cr ions increased and the amount of N ions strongly decreased at higher laser pulse energies. Further, increased detection of more complex Cr-containing ions such as Cr 2N at the expense of CrN was observed at higher pulse energies. At the highest pulse energy levels used within this work, the resulting Cr content was > 80 at%, dominated by the amount of detected elemental Cr ions. The change of the mass spectrum of the detected ions with increasing laser pulse energy provides evidence that high laser pulse energies initiate the decomposition of CrN during the APT measurement, consistent with the known thermal decomposition path into Cr 2N and subsequently into Cr and gaseous N. In contrast, variation of the laser pulse energy for the thermally more stable CrAlN resulted only in a slight increase of Cr and a decrease of the resulting concentrations of Al and N with increasing laser pulse energy and no change in the type of detected ions. In conclusion, within the present study, the decomposition of a coating material with low thermal stability induced by laser-assisted APT was reported for the first time, emphasizing the importance of the selection of suitable measurement parameters for metastable materials, which are prone to thermal decomposition.

Frühes Online-Datum27 Dez. 2022
PublikationsstatusVeröffentlicht - Apr. 2023

Bibliographische Notiz

Funding Information:
The financial support by the Austrian Federal Ministry for Digital and Economic Affairs and the National Foundation for Research, Technology and Development is gratefully acknowledged. This research was also funded by German Research Foundation (DFG, SFB-TR 87/3 ) "Pulsed high power plasmas for the synthesis of nanostructured functional layers". Transnational access to the ion beam analysis facility at Uppsala University has been supported by the RADIATE project under the Grant Agreement 824096 from the EU Research and Innovation program HORIZON 2020 . Accelerator operation at Uppsala University has been supported by the Swedish research council VR-RFI ( #2019-00191 ). The authors gratefully acknowledge the financial support of the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant No. 771146 TOUGHIT ).

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© 2022

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