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

Dincer I., Yuzuak E., Durak G., Elerman Y., BELL A. M. T., EHRENBERG H.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.540, ss.236-240, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 540
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.jallcom.2012.05.072
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.236-240
  • Anahtar Kelimeler: Magnetocaloric effect, Martensitic transition, Synchrotron measurements, TRANSFORMATION, SYSTEM
  • Recep Tayyip Erdoğan Üniversitesi Adresli: Hayır

Özet

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 P6(3)/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. (C) 2012 Elsevier B.V. All rights reserved.