Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY

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Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY. / Ari-Gur, Pnina; Garlea, V. Ovidiu; Coke, Ashley; Ge, Yanling; Aaltio, Ilkka; Hannula, Simo-Pekka; Cao, Huibo; Madiligama, Amila Sb; Koledov, Victor.

In: Materials Science Forum, Vol. 738-739, 01.2013, p. 103-107.

Research output: Contribution to journalArticleScientificpeer-review

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Ari-Gur, P, Garlea, VO, Coke, A, Ge, Y, Aaltio, I, Hannula, S-P, Cao, H, Madiligama, AS & Koledov, V 2013, 'Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY', Materials Science Forum, vol. 738-739, pp. 103-107. https://doi.org/10.4028/www.scientific.net/MSF.738-739.103

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Ari-Gur, Pnina ; Garlea, V. Ovidiu ; Coke, Ashley ; Ge, Yanling ; Aaltio, Ilkka ; Hannula, Simo-Pekka ; Cao, Huibo ; Madiligama, Amila Sb ; Koledov, Victor. / Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY. In: Materials Science Forum. 2013 ; Vol. 738-739. pp. 103-107.

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@article{fdf57e1805124c708b366bff2e5901e7,
title = "Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY",
abstract = "The structure and chemical order of a Heusler alloy of non-stoichiometric composition Ni-Mn-Ga were studied using constant-wavelength (1.538 {\AA}) neutron diffraction at 363K and the diffraction pattern was refined using the FullProf software. At this temperature the structure is austenite (cubic) with Fm-3m space group and lattice constant of a = 5.83913(4) [{\AA}]. The chemical order is of critical importance in these alloys, as Mn becomes antiferromagnetic when the atoms are closer than the radius of the 3d shell. In the studied alloy the refinement of the site occupancy showed that the 4b (Ga site) contained as much as 22{\%} Mn; that significantly alters the distances between the Mn atoms in the crystal and, as a result, also the exchange energy between some of the Mn atoms. Based on the refinement, the composition was determined to be Ni1.91Mn1.29Ga0.8.",
keywords = "Chemical order, Magnetic shape memory, Neutron diffraction, Ni-Mn-Ga alloy, Rietveld method, Structure refinement",
author = "Pnina Ari-Gur and Garlea, {V. Ovidiu} and Ashley Coke and Yanling Ge and Ilkka Aaltio and Simo-Pekka Hannula and Huibo Cao and Madiligama, {Amila Sb} and Victor Koledov",
year = "2013",
month = "1",
doi = "10.4028/www.scientific.net/MSF.738-739.103",
language = "English",
volume = "738-739",
pages = "103--107",
journal = "Materials Science Forum",
issn = "0255-5476",
publisher = "TRANS TECH PUBLICATIONS",

}

RIS - Download

TY - JOUR

T1 - Neutron diffraction study of a non-stoichiometric Ni-Mn-Ga MSM ALLOY

AU - Ari-Gur, Pnina

AU - Garlea, V. Ovidiu

AU - Coke, Ashley

AU - Ge, Yanling

AU - Aaltio, Ilkka

AU - Hannula, Simo-Pekka

AU - Cao, Huibo

AU - Madiligama, Amila Sb

AU - Koledov, Victor

PY - 2013/1

Y1 - 2013/1

N2 - The structure and chemical order of a Heusler alloy of non-stoichiometric composition Ni-Mn-Ga were studied using constant-wavelength (1.538 Å) neutron diffraction at 363K and the diffraction pattern was refined using the FullProf software. At this temperature the structure is austenite (cubic) with Fm-3m space group and lattice constant of a = 5.83913(4) [Å]. The chemical order is of critical importance in these alloys, as Mn becomes antiferromagnetic when the atoms are closer than the radius of the 3d shell. In the studied alloy the refinement of the site occupancy showed that the 4b (Ga site) contained as much as 22% Mn; that significantly alters the distances between the Mn atoms in the crystal and, as a result, also the exchange energy between some of the Mn atoms. Based on the refinement, the composition was determined to be Ni1.91Mn1.29Ga0.8.

AB - The structure and chemical order of a Heusler alloy of non-stoichiometric composition Ni-Mn-Ga were studied using constant-wavelength (1.538 Å) neutron diffraction at 363K and the diffraction pattern was refined using the FullProf software. At this temperature the structure is austenite (cubic) with Fm-3m space group and lattice constant of a = 5.83913(4) [Å]. The chemical order is of critical importance in these alloys, as Mn becomes antiferromagnetic when the atoms are closer than the radius of the 3d shell. In the studied alloy the refinement of the site occupancy showed that the 4b (Ga site) contained as much as 22% Mn; that significantly alters the distances between the Mn atoms in the crystal and, as a result, also the exchange energy between some of the Mn atoms. Based on the refinement, the composition was determined to be Ni1.91Mn1.29Ga0.8.

KW - Chemical order

KW - Magnetic shape memory

KW - Neutron diffraction

KW - Ni-Mn-Ga alloy

KW - Rietveld method

KW - Structure refinement

UR - http://www.scopus.com/inward/record.url?scp=84874091636&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.738-739.103

DO - 10.4028/www.scientific.net/MSF.738-739.103

M3 - Article

AN - SCOPUS:84874091636

VL - 738-739

SP - 103

EP - 107

JO - Materials Science Forum

JF - Materials Science Forum

SN - 0255-5476

ER -

ID: 4681808