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Issue 3, 2021
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Mayenite-based electride C12A7e: an innovative synthetic method via plasma arc melting

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Abstract

Mayenite-based electrides have been reported as promising support materials for applications in heterogeneous catalysis. However, the current synthetic access to mayenite materials is limited by a method portfolio of complex procedures far from industrial applicability and thus hinders research and application in a broader context. We report the first plasma-based synthesis of the mayenite-based electride [Ca24Al28O64]4+:(4e) obtained by plasma treatment of oxygen-mayenite solid-reductant precursor mixtures. Aluminum and graphite can be successfully used as solid reductant: while aluminum leads to enhanced secondary phase formation of krotite during the treatment, the use of graphite as solid reductant, leads to phase-pure samples. We further critically discuss challenges and limitations in applying literature reported methods to quantitatively determine the electron concentration of the electrides. For this purpose, EPR-, DRUV/vis-spectroscopy, Rietveld refinement of PXRD and DSC-TG analysis under oxidizing atmosphere were applied and critically revised. We show the possibilities using the facile plasma-based synthesis as a scalable method to obtain semiconducting and close to metallic conducting electrides.

Graphical abstract: Mayenite-based electride C12A7e−: an innovative synthetic method via plasma arc melting

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Supplementary files

Article information


Submitted
10 Sep 2020
Accepted
04 Dec 2020
First published
09 Dec 2020

This article is Open Access

Mater. Chem. Front., 2021,5, 1301-1314
Article type
Research Article

Mayenite-based electride C12A7e: an innovative synthetic method via plasma arc melting

S. Weber, S. Schäfer, M. Saccoccio, K. Seidel, H. Kohlmann, R. Gläser and S. A. Schunk, Mater. Chem. Front., 2021, 5, 1301
DOI: 10.1039/D0QM00688B

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