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Structural, magnetic and electrical transport properties of non-conventionally prepared MAX phases V2AlC and (V/Mn)2AlC

Hamm, Christin M. and Dürrschnabel, Michael and Molina-Luna, Leopoldo and Salikhov, Ruslan and Spoddig, Detlef and Farle, Michael and Wiedwald, Ulf and Birkel, Christina S. :
Structural, magnetic and electrical transport properties of non-conventionally prepared MAX phases V2AlC and (V/Mn)2AlC.
In: Materials Chemistry Frontiers, 2 pp. 483-490. ISSN 2052-1537
[Article] , (2018)

Abstract

A plethora of magnetic ground states along with intriguing magnetic properties have been reported in thin films of Mn-containing MAX phases. However, fewer results and therefore less knowledge in the area of bulk magnetic MAX phases exist resulting in many open research questions that still remain unanswered. Synthesis of high quality materials is key and is here achieved for bulk V2AlC and its Mn-doped analogs by means of microwave heating and spark plasma sintering. The obtained materials are carefully characterized by structural and microstructural investigations resulting in an average Mn-content of 2% corresponding to the mean chemical composition of (V0.96±0.02Mn0.04±0.02)2AlC in the Mn-doped V2AlC samples. While the parent MAX phase as well as the sample with the nominally lowest Mn-content are obtained essentially single-phase, samples with higher Mn-levels exhibit Mn-rich side phases. These are most likely responsible for the ferromagnetic behavior of the corresponding bulk materials. Besides, we show Pauli paramagnetism of the parent compound V2AlC and a combination of Pauli and Langevin paramagnetism in (V0.96±0.02Mn0.04±0.02)2AlC. For the latter, a magnetic moment of μM = 0.2(2) μB per M atom can be extracted.

Item Type: Article
Erschienen: 2018
Creators: Hamm, Christin M. and Dürrschnabel, Michael and Molina-Luna, Leopoldo and Salikhov, Ruslan and Spoddig, Detlef and Farle, Michael and Wiedwald, Ulf and Birkel, Christina S.
Title: Structural, magnetic and electrical transport properties of non-conventionally prepared MAX phases V2AlC and (V/Mn)2AlC
Language: English
Abstract:

A plethora of magnetic ground states along with intriguing magnetic properties have been reported in thin films of Mn-containing MAX phases. However, fewer results and therefore less knowledge in the area of bulk magnetic MAX phases exist resulting in many open research questions that still remain unanswered. Synthesis of high quality materials is key and is here achieved for bulk V2AlC and its Mn-doped analogs by means of microwave heating and spark plasma sintering. The obtained materials are carefully characterized by structural and microstructural investigations resulting in an average Mn-content of 2% corresponding to the mean chemical composition of (V0.96±0.02Mn0.04±0.02)2AlC in the Mn-doped V2AlC samples. While the parent MAX phase as well as the sample with the nominally lowest Mn-content are obtained essentially single-phase, samples with higher Mn-levels exhibit Mn-rich side phases. These are most likely responsible for the ferromagnetic behavior of the corresponding bulk materials. Besides, we show Pauli paramagnetism of the parent compound V2AlC and a combination of Pauli and Langevin paramagnetism in (V0.96±0.02Mn0.04±0.02)2AlC. For the latter, a magnetic moment of μM = 0.2(2) μB per M atom can be extracted.

Journal or Publication Title: Materials Chemistry Frontiers
Volume: 2
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 > Advanced Electron Microscopy (aem)
07 Fachbereich Chemie
07 Fachbereich Chemie > Fachgebiet Anorganische Chemie
Date Deposited: 12 Jan 2018 07:57
DOI: 10.1039/C7QM00488E
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., M. D. and L. M.-L. also acknowledge financial support from the Hessen State Ministry of Higher Education Research and the Arts via LOEWE RESPONSE., L. M.-L. acknowledges financial support from DFG Grant MO 3010/3-1., . The transmission electron microscope used in this work was partially funded by the German Research Foundation (DFG/INST163/2951), R. S. acknowledges funding by the DFG under grant number SA 3095/2-1.
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