The influence of gallium on the magnetocaloric properties of Gd5Si2Ge2

Seda Aksoy*, Atila Yucel, Yalcin Elerman, Thorsten Krenke, Mehmet Acet, Xavier Moya, Lluís Mañosa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Gd5Si2Ge2 was alloyed with varying amounts of Ga to study its influence on the giant magnetocaloric effect. Investigations on Gd5(Si2-xGe2-x)Ga2x with 2x = 0.03, 0.05 and 0.13 were carried out using X-ray powder diffraction, temperature and magnetic field dependent magnetization measurements, and differential scanning calorimetry. We observe that as the Ga content increases, the temperature stability range of the monoclinic phase narrows, and the orthorhombic structure gains stability. This is expected to be related to the decrease in the (Si/Ge){single bond}(Si/Ge) bond distance in the monoclinic phase. The maximum entropy change for the parent compound at 270 K was found to be 9.8 J kg-1 K-1 in an applied field of 5 T. For 2x = 0.03, this value reduces to 8.5 J kg-1 K-1, and the temperature corresponding to the maximum entropy change shifts marginally to 278 K. For other 2x values, the maximum entropy change further decreases.

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalJournal of Alloys and Compounds
Volume460
Issue number1-2
DOIs
Publication statusPublished - 28 Jul 2008
Externally publishedYes

Funding

We acknowledge gratefully P. Hinkel for compositional analysis. This work was supported by the Scientific and Technological Research Council of Turkey under project No. 104T382, Forshungszentrum Jülich under project No. WTZ TUR 04/011 and CICyT (Spain) project No. MAT2004-1291. XM acknowledges support from DGICyT (Spain).

FundersFunder number
DGICyT
Forshungszentrum JülichWTZ TUR 04/011
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu104T382
Comisión Interministerial de Ciencia y TecnologíaMAT2004-1291

    Keywords

    • Entropy change
    • Intermetallic compounds
    • Magnetocaloric effect

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