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Non-conventional synthesis and magnetic properties of MAX phases (Cr/Mn)2AlC and (Cr/Fe)2AlC

Hamm, Christin M. and Bocarsly, Joshua D. and Seward, Gareth and Kramm, Ulrike I. and Birkel, Christina S. (2017):
Non-conventional synthesis and magnetic properties of MAX phases (Cr/Mn)2AlC and (Cr/Fe)2AlC.
In: Journal of Materials Chemistry C, Royal Society of Chemistry, pp. 5700-5708, 5, (23), ISSN 2050-7526, DOI: 10.1039/C7TC00112F, [Online-Edition: https://doi.org/10.1039/C7TC00112F],
[Article]

Abstract

A few years after the theoretical prediction of magnetic MAX phases, a number of such materials have been experimentally reported, especially in the form of thin films. Yet, due to a relatively small number of studies, we have only just begun to discover the intriguing magnetic properties that are associated with this class of materials. The preparation of bulk MAX phases with later transition metals has been proven to be particularly challenging. Consequentially, there is a great need to develop synthetic strategies to obtain the respective materials in suitable quantities for magnetic investigations. Here, bulk Mn- and Fe-substituted Cr2AlC are prepared using non-conventional synthesis methods such as microwave heating and spark plasma sintering. Synchrotron X-ray diffraction coupled with detailed elemental analyses is used to confirm the successful doping of the MAX phase with the later transition metals as well as to elucidate the microstructure of the obtained dense materials. 57Fe Mössbauer spectroscopy data are presented showing signals of the doped MAX phase and Fe-containing secondary phases. Based on PPMS and SQUID measurements the non-trivial magnetic behavior of the obtained samples is discussed in the context of the existing studies.

Item Type: Article
Erschienen: 2017
Creators: Hamm, Christin M. and Bocarsly, Joshua D. and Seward, Gareth and Kramm, Ulrike I. and Birkel, Christina S.
Title: Non-conventional synthesis and magnetic properties of MAX phases (Cr/Mn)2AlC and (Cr/Fe)2AlC
Language: English
Abstract:

A few years after the theoretical prediction of magnetic MAX phases, a number of such materials have been experimentally reported, especially in the form of thin films. Yet, due to a relatively small number of studies, we have only just begun to discover the intriguing magnetic properties that are associated with this class of materials. The preparation of bulk MAX phases with later transition metals has been proven to be particularly challenging. Consequentially, there is a great need to develop synthetic strategies to obtain the respective materials in suitable quantities for magnetic investigations. Here, bulk Mn- and Fe-substituted Cr2AlC are prepared using non-conventional synthesis methods such as microwave heating and spark plasma sintering. Synchrotron X-ray diffraction coupled with detailed elemental analyses is used to confirm the successful doping of the MAX phase with the later transition metals as well as to elucidate the microstructure of the obtained dense materials. 57Fe Mössbauer spectroscopy data are presented showing signals of the doped MAX phase and Fe-containing secondary phases. Based on PPMS and SQUID measurements the non-trivial magnetic behavior of the obtained samples is discussed in the context of the existing studies.

Journal or Publication Title: Journal of Materials Chemistry C
Volume: 5
Number: 23
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Catalysts and Electrocatalysts
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 17 Aug 2017 10:53
DOI: 10.1039/C7TC00112F
Official URL: https://doi.org/10.1039/C7TC00112F
Additional Information:

This article is part of the themed collection: Journal of Materials Chemistry C Emerging Investigators

Funders: Financial support by the DFG (BI 1775/2-1) and the German federal state of Hessen through its excellence program LOEWE “RESPONSE” is gratefully acknowledged., UIK acknowledges financial support of the German Research Foundation for the graduate school of Excellence Energy Science and Engineering (GSC1070)., CMH was supported at UCSB by the IMI Program of the National Science Foundation under Award No. DMR 0843934., JDB is supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. 1650114., The MRL Shared Experimental Facilities are supported by the MRSEC Program of the NSF under Award No. DMR 1121053, a member of the NSF-funded Materials Research Facilities Network.
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