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Journal of Materials Science

, Volume 51, Issue 19, pp 8824–8844 | Cite as

In situ monitoring and ex situ TEM analyses of spinel (MgAl\(_2\)O\(_4\)) growth between (111)-oriented periclase (MgO) substrates and Al\(_2\)O\(_3\) thin films

  • L. C. GötzeEmail author
  • R. Milke
  • I. Zizak
  • R. Wirth
Original Paper
  • 333 Downloads

Abstract

We investigated the temperature-dependent onset and subsequent reaction kinetics of spinel (MgAl\(_2\)O\(_4\)) interlayer growth in situ at T = 800–1000 \(^{\circ }\)C in air by means of energy-dispersive as well as wavelength-dispersive synchrotron X-ray diffraction. We observed growth using a diffusion–reaction couple setup in which (111)-oriented periclase (MgO) single-crystal substrates reacted with initially amorphous Al\(_2\)O\(_3\) thin films deposited via pulsed laser ablation. Microstructures and microtextures of the nanoscale reaction bands were analyzed ex situ using focused ion beam (FIB)-assisted transmission electron microscopy (TEM). Reaction bands grew topotactically into the substrates with the orientation relation (111) periclase || (111) spinel and 〈110〉 periclase || 〈110〉 spinel. We inferred temperature-dependent diffusion-controlled, mixed, and interface-controlled reaction kinetics from the increase of the integral intensity of the 111 spinel reflection during the in situ experiments. In case spinel formed, a porous layer at the periclase/spinel interface was found using TEM, displaying the negative reaction volume at this phase boundary. Results are compared with complementary experiments in which spinel growth was monitored using (0001)-oriented corundum (\(\upalpha \)-Al\(_2\)O\(_3\), sapphire) substrates that reacted with MgO thin films [1]. The onset of spinel growth was observed at lower temperatures using periclase substrates, and an offset of about 100 K resulted in similar reaction kinetics. The positive reaction volume at the corundum/spinel interface was displayed by bend contours in TEM micrographs. Combined results suggest that the negative reaction volume at the periclase/spinel phase boundary has a crucial effect on the onset of spinel growth and subsequent reaction kinetics.

Keywords

Reactant Layer Reaction Band Spinel Layer HAADF Image Periclase Substrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

R. Dohmen from the Ruhr University Bochum helped with the ablation of thin films via PLD. The EDDI beamline scientists M. Klaus and C. Genzel are thanked for assistance during beamtime, and R. Gunder is acknowledged for help during the in situ experiments. A. Schreiber and S. Gehrmann from the GFZ are acknowledged for the FIB extraction of TEM foils and substrate preparation, respectively. This study was funded by the German Research Foundation (grant number MI 1205/4-2) in the framework of the German research group FOR 741 ’Nanoscale Processes and Geomaterials Properties.’

Funding

This study was funded by the German Research Foundation (grant number MI 1205/4-2).

Compliance with ethical standards

Conflict of interest

The authors declare that we have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Institute of Geological SciencesFreie Universität BerlinBerlinGermany
  2. 2.Helmholtz-Zentrum Berlin for Materials and EnergyBerlinGermany
  3. 3.GFZ German Research Centre for GeosciencesPotsdamGermany

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