Comparative study between melted and mechanically alloyed samples of the Fe50Mn10Al40 nanostructured system

C. González; G. A. Pérez Alcázar; L. E. Zamora; J. M. Greneche; J. J. Romero; E. Martin-Blanco; J. M. González; J. F. Marco

doi:10.1007/s10751-008-9772-z

Comparative study between melted and mechanically alloyed samples of the Fe₅₀Mn₁₀Al₄₀ nanostructured system

C. González, G. A. Pérez Alcázar, L. E. Zamora, J. M. Greneche, J. J. Romero, E. Martin-Blanco, J. M. González, J. F. Marco

Research output: Contribution to journal › Article in an indexed scientific journal › peer-review

2 Scopus citations

Abstract

Nanostructured powders of melted and 48 h-mechanically alloyed (MA) samples of the Fe₅₀Mn₁₀Al₄₀ system were studied by XRD, SEM and Mössbauer spectroscopy (MS), and their properties were compared. The samples present BCC structure with similar mean lattice parameter (near 2.92 Å) and grain size (around 22 nm). The MA sample presents additionally the α-Fe phase. Mössbauer spectra of the samples present a hyperfine field distribution (HFD), a broad paramagnetic (P) site and a sextet showing that the BCC ternary phase is disordered with Fe sites in environments rich in Fe (HFD) and rich in Al and Mn (P), respectively. The mean hyperfine magnetic field vs. temperature curve of melted sample presents two kinks, one at 28 K and other at 210 K and a Curie temperature at 340 K. A similar curve is observed for the milled sample but the kinks occur at 65 and 265K. Mössbauer spectra at different temperatures with and without applied field permit to conclude that the low temperature anomaly corresponds to the freezing temperature of a re-entrant spin-glass phase (RSG) and that of the second one corresponds to a blocking temperature of a superparamagnetic (SP) phase. These phases are possible in the samples due to their disordered character induced by the preparation conditions and the competitive interactions of the Fe and Mn atoms. The enhancement of the magnetic behaviour of the MA sample is due its larger disorder induced by the preparation method that can also explain the increase of the RSG and SP transition temperatures.

Original language	English
Pages (from-to)	97-103
Number of pages	7
Journal	Hyperfine Interactions
Volume	184
Issue number	1-3
DOIs	https://doi.org/10.1007/s10751-008-9772-z
State	Published - Jun 2008

Bibliographical note

Funding Information:
Acknowledgements The authors would like to thank the financial support given to this work by Ecos-Nord-Colciencias and Colciencias-CSIC (Colombian, Brazilian and Spanish agencies) across collaboration projects. G.A.P.A. thanks the Science and Culture Spanish Ministry for a Sabbatical Year Grant and the Universidad del Valle for the Sabbatical Year license. Financial support from the Comunidad Autónoma de Madrid under project S-0505/MAT/0194 is also gratefully.

Keywords

FeMnAl nanostructured system
Hyperfine field distribution
Mössbauer spectrometry
XRD

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10.1007/s10751-008-9772-z

Cite this

@article{22433b9f78b24dcda0e959c178953ec8,

title = "Comparative study between melted and mechanically alloyed samples of the Fe50Mn10Al40 nanostructured system",

abstract = "Nanostructured powders of melted and 48 h-mechanically alloyed (MA) samples of the Fe50Mn10Al40 system were studied by XRD, SEM and M{\"o}ssbauer spectroscopy (MS), and their properties were compared. The samples present BCC structure with similar mean lattice parameter (near 2.92 {\AA}) and grain size (around 22 nm). The MA sample presents additionally the α-Fe phase. M{\"o}ssbauer spectra of the samples present a hyperfine field distribution (HFD), a broad paramagnetic (P) site and a sextet showing that the BCC ternary phase is disordered with Fe sites in environments rich in Fe (HFD) and rich in Al and Mn (P), respectively. The mean hyperfine magnetic field vs. temperature curve of melted sample presents two kinks, one at 28 K and other at 210 K and a Curie temperature at 340 K. A similar curve is observed for the milled sample but the kinks occur at 65 and 265K. M{\"o}ssbauer spectra at different temperatures with and without applied field permit to conclude that the low temperature anomaly corresponds to the freezing temperature of a re-entrant spin-glass phase (RSG) and that of the second one corresponds to a blocking temperature of a superparamagnetic (SP) phase. These phases are possible in the samples due to their disordered character induced by the preparation conditions and the competitive interactions of the Fe and Mn atoms. The enhancement of the magnetic behaviour of the MA sample is due its larger disorder induced by the preparation method that can also explain the increase of the RSG and SP transition temperatures.",

keywords = "FeMnAl nanostructured system, Hyperfine field distribution, M{\"o}ssbauer spectrometry, XRD",

author = "C. Gonz{\'a}lez and {P{\'e}rez Alc{\'a}zar}, {G. A.} and Zamora, {L. E.} and Greneche, {J. M.} and Romero, {J. J.} and E. Martin-Blanco and Gonz{\'a}lez, {J. M.} and Marco, {J. F.}",

note = "Funding Information: Acknowledgements The authors would like to thank the financial support given to this work by Ecos-Nord-Colciencias and Colciencias-CSIC (Colombian, Brazilian and Spanish agencies) across collaboration projects. G.A.P.A. thanks the Science and Culture Spanish Ministry for a Sabbatical Year Grant and the Universidad del Valle for the Sabbatical Year license. Financial support from the Comunidad Aut{\'o}noma de Madrid under project S-0505/MAT/0194 is also gratefully.",

year = "2008",

month = jun,

doi = "10.1007/s10751-008-9772-z",

language = "Ingl{\'e}s",

volume = "184",

pages = "97--103",

journal = "Hyperfine Interactions",

issn = "0304-3843",

publisher = "Springer Nature",

number = "1-3",

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TY - JOUR

T1 - Comparative study between melted and mechanically alloyed samples of the Fe50Mn10Al40 nanostructured system

AU - González, C.

AU - Pérez Alcázar, G. A.

AU - Zamora, L. E.

AU - Greneche, J. M.

AU - Romero, J. J.

AU - Martin-Blanco, E.

AU - González, J. M.

AU - Marco, J. F.

N1 - Funding Information: Acknowledgements The authors would like to thank the financial support given to this work by Ecos-Nord-Colciencias and Colciencias-CSIC (Colombian, Brazilian and Spanish agencies) across collaboration projects. G.A.P.A. thanks the Science and Culture Spanish Ministry for a Sabbatical Year Grant and the Universidad del Valle for the Sabbatical Year license. Financial support from the Comunidad Autónoma de Madrid under project S-0505/MAT/0194 is also gratefully.

PY - 2008/6

Y1 - 2008/6

N2 - Nanostructured powders of melted and 48 h-mechanically alloyed (MA) samples of the Fe50Mn10Al40 system were studied by XRD, SEM and Mössbauer spectroscopy (MS), and their properties were compared. The samples present BCC structure with similar mean lattice parameter (near 2.92 Å) and grain size (around 22 nm). The MA sample presents additionally the α-Fe phase. Mössbauer spectra of the samples present a hyperfine field distribution (HFD), a broad paramagnetic (P) site and a sextet showing that the BCC ternary phase is disordered with Fe sites in environments rich in Fe (HFD) and rich in Al and Mn (P), respectively. The mean hyperfine magnetic field vs. temperature curve of melted sample presents two kinks, one at 28 K and other at 210 K and a Curie temperature at 340 K. A similar curve is observed for the milled sample but the kinks occur at 65 and 265K. Mössbauer spectra at different temperatures with and without applied field permit to conclude that the low temperature anomaly corresponds to the freezing temperature of a re-entrant spin-glass phase (RSG) and that of the second one corresponds to a blocking temperature of a superparamagnetic (SP) phase. These phases are possible in the samples due to their disordered character induced by the preparation conditions and the competitive interactions of the Fe and Mn atoms. The enhancement of the magnetic behaviour of the MA sample is due its larger disorder induced by the preparation method that can also explain the increase of the RSG and SP transition temperatures.

AB - Nanostructured powders of melted and 48 h-mechanically alloyed (MA) samples of the Fe50Mn10Al40 system were studied by XRD, SEM and Mössbauer spectroscopy (MS), and their properties were compared. The samples present BCC structure with similar mean lattice parameter (near 2.92 Å) and grain size (around 22 nm). The MA sample presents additionally the α-Fe phase. Mössbauer spectra of the samples present a hyperfine field distribution (HFD), a broad paramagnetic (P) site and a sextet showing that the BCC ternary phase is disordered with Fe sites in environments rich in Fe (HFD) and rich in Al and Mn (P), respectively. The mean hyperfine magnetic field vs. temperature curve of melted sample presents two kinks, one at 28 K and other at 210 K and a Curie temperature at 340 K. A similar curve is observed for the milled sample but the kinks occur at 65 and 265K. Mössbauer spectra at different temperatures with and without applied field permit to conclude that the low temperature anomaly corresponds to the freezing temperature of a re-entrant spin-glass phase (RSG) and that of the second one corresponds to a blocking temperature of a superparamagnetic (SP) phase. These phases are possible in the samples due to their disordered character induced by the preparation conditions and the competitive interactions of the Fe and Mn atoms. The enhancement of the magnetic behaviour of the MA sample is due its larger disorder induced by the preparation method that can also explain the increase of the RSG and SP transition temperatures.

KW - FeMnAl nanostructured system

KW - Hyperfine field distribution

KW - Mössbauer spectrometry

KW - XRD

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U2 - 10.1007/s10751-008-9772-z

DO - 10.1007/s10751-008-9772-z

M3 - Artículo en revista científica indexada

AN - SCOPUS:67650462756

SN - 0304-3843

VL - 184

SP - 97

EP - 103

JO - Hyperfine Interactions

JF - Hyperfine Interactions

IS - 1-3

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