The overlap of first and second order phase transitions and related magnetic entropy changes in Ni2+xMn1-xGa Heusler alloys

Author

Khan, M. ; Stadler, S. ; Craig, J. ; Mitchell, J. ; Ali, N.

Author_Institution

Southern Illinois Univ., Carbondale

fYear

2006

fDate

8-12 May 2006

Firstpage

672

Lastpage

672

Abstract

In this paper we present a study on the gradual overlap of the first order and second order phase transitions and the related magnetic entropy changes of polycrystalline Ni_2+xMn_1-xGa (x = 0.16, 0.17,0.18,0.19,0.20). The magnetization measurements were performed on a superconducting quantum interference device (SQUID) made by Quantum Design Inc. X-ray diffraction patterns of Ni_2+xMn_1-xGa (x =0.16, 0.17, 0.18, 0.19, 0.20) shows that the alloys are single phase and possess the martensitic phase in room temperature. Studies of the magnetostructural transitions and magnetic entropy changes in polycrystalline Ni_2+xMn_1-xGa (x = 0.17, 0.18, 0.19, 0.20) have been done.

Keywords

X-ray diffraction; ferromagnetic-paramagnetic transitions; gallium alloys; magnetisation; manganese alloys; martensitic transformations; nickel alloys; Heusler alloys; Ni₂MnGa; SQUID; X-ray diffraction; ferromagnetic-paramagnetic transition; first order magnetostructural transition; magnetic entropy; magnetization measurements; martensitic transition; second order phase transition; superconducting quantum interference device; temperature 293 K to 298 K; Entropy; Gallium alloys; Interference; Magnetization; Manganese alloys; Performance evaluation; SQUIDs; Superconducting devices; Superconducting magnets; X-ray diffraction;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2006. INTERMAG 2006. IEEE International

Conference_Location

San Diego, CA

Print_ISBN

1-4244-1479-2

Type

conf

DOI

10.1109/INTMAG.2006.376396

Filename

4262105