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

Hamm, Christin M. ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Salikhov, Ruslan ; Spoddig, Detlef ; Farle, Michael ; Wiedwald, Ulf ; 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 S. 483-490. ISSN 2052-1537
[Artikel] , (2018)

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Hamm, Christin M. ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Salikhov, Ruslan ; Spoddig, Detlef ; Farle, Michael ; Wiedwald, Ulf ; Birkel, Christina S.
Titel: Structural, magnetic and electrical transport properties of non-conventionally prepared MAX phases V2AlC and (V/Mn)2AlC
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Materials Chemistry Frontiers
Band: 2
Verlag: Royal Society of Chemistry
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie
07 Fachbereich Chemie
07 Fachbereich Chemie > Fachgebiet Anorganische Chemie
Hinterlegungsdatum: 12 Jan 2018 07:57
DOI: 10.1039/C7QM00488E
Sponsoren: 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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