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

DINCER, I., YÜZÜAK, E., DURAK, G., ELERMAN, Y., BELL, Anthony and EHRENBERG, H. (2012). Exploring the details of the martensitic phase transition and magnetocaloric effect of CoMnGe0.95Ga0.05 by synchrotron and magnetic measurements. Journal of Alloys and Compounds, 540, 236-240.

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Official URL: https://www.sciencedirect.com/science/article/pii/...
Link to published version:: https://doi.org/10.1016/j.jallcom.2012.05.072
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    Abstract

    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 650 K to 315 K. 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 −5.2 J kg−1 K−1 in field of 1 T. Highlights ► 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 −5.2 J kg−1 K−1 in magnetic field change of 1 T.

    Item Type: Article
    Uncontrolled Keywords: 0912 Materials Engineering; 0914 Resources Engineering And Extractive Metallurgy; 0204 Condensed Matter Physics; Materials
    Identification Number: https://doi.org/10.1016/j.jallcom.2012.05.072
    Page Range: 236-240
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 08 Jan 2019 13:31
    Last Modified: 08 Jan 2019 13:31
    URI: http://shura.shu.ac.uk/id/eprint/23637

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