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The Average Valence Electron Number: Is it a relevant parameter for Ni2MnGa Alloys?

Published online by Cambridge University Press:  31 January 2011

Kristin Neumann ,
Khaled Elmashai ,
Tilmann Hickel ,
Klaus-Ulrich Neumann ,
Bachir Ouladdiaf  and
Kurt Ziebeck
Kristin Neumann
Affiliation:
K.Neumann@Lboro.ac.uk, Loughborough University, Physics, Loughborough, United Kingdom
Khaled Elmashai
Affiliation:
K.Elmashai@Lboro.ac.uk, Loughborough University, Physics, Loughborough, United Kingdom
Tilmann Hickel
Affiliation:
t.hickel@mpie.de, Institut fuer Eisenforschung, Duesseldorf, Germany
Klaus-Ulrich Neumann
Affiliation:
K.U.Neumann@Lboro.ac.uk, Loughborough University, Physics, Loughborough, United Kingdom
Bachir Ouladdiaf
Affiliation:
Ouladdiaf@ill.fr, Institute Laue-Langevin, Grenoble, France
Kurt Ziebeck
Affiliation:
K.R.Ziebeck@Lboro.ac.uk, Loughborough University, Physics, Loughborough, United Kingdom
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Abstract

The influence is investigated of the average valence electron number on the systematic changes of a Ni2MnGa based alloy series. The experimental investigation focuses on an isoelectronic alloy series Ni2Mnx(CrFe)1-x/2Ga for which the average valence electron number is unchanged for any value of x. Based on the changes of physical properties of alloys in this series compared to Ni2MnGa it is argued that local lattice distortions are more relevant for driving the change in alloy characteristics, such as the martensitic phase transition temperature or the ferromagnetic ordering temperature, than the band filling by valence electrons.

Keywords

neutron scatteringmemorycrystallographic structure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1200: Symposium G – Magnetic Shape Memory Alloys , 2009 , 1200-G03-01
Copyright
Copyright © Materials Research Society 2010

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