Exploring the details of the martensitic phase transition and magnetocaloric effect of CoMnGe0.95Ga0.05 by synchrotron and magnetic measurements

► CoMnGe0.95Ga0.05 alloy shows a structural phase transformation from hexagonal to orthorhombic. ► In CoMnGe0.95Ga0.05, the giant magnetocaloric effect is observed around room temperature. ► The maximum magnetic entropy change is −5.2Jkg−1K−1 in magnetic field change of 1T. The structural, magnetic...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2012-11, Vol.540, p.236-240
Main Authors: Dincer, I., Yüzüak, E., Durak, G., Elerman, Y., Bell, A.M.T., Ehrenberg, H.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cooling effects
Cross-disciplinary physics: materials science
rheology
Entropy
Exact sciences and technology
Gallium base alloys
Germanium
Magnetic fields
Magnetic measurement
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetocaloric effect
Magnetocaloric effect, magnetic cooling
Martensitic transformations
Martensitic transition
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Synchrotron measurements
Synchrotrons
Transition temperature
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► CoMnGe0.95Ga0.05 alloy shows a structural phase transformation from hexagonal to orthorhombic. ► In CoMnGe0.95Ga0.05, the giant magnetocaloric effect is observed around room temperature. ► The maximum magnetic entropy change is −5.2Jkg−1K−1 in magnetic field change of 1T. The structural, magnetic and magnetocaloric properties of CoMnGe0.95Ga0.05 have been investigated by using electron microscopy, calorimetric, synchrotron and magnetic measurements. The substitution of Ga for Ge leads to decreasing on the martensitic transition temperature from 650K to 315K. CoMnGe0.95Ga0.05 has hexagonal structure (space group P63/mmc) above the martensitic transition temperature and orthorhombic structure (space group Pnma) below this temperature. The magnetic field dependence of magnetization measurements are performed in the heating and cooling processes around the martensitic transition temperature to determine magnetocaloric effect. It is observed that the magnetic entropy change associated with the martensitic transition temperature can be as high as −5.2Jkg−1K−1 in field of 1T.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2012.05.072