The influence of gallium on the magnetocaloric properties of Gd5Si2Ge2

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

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19 Atıf (Scopus)

Özet

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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)94-98
Sayfa sayısı5
DergiJournal of Alloys and Compounds
Hacim460
Basın numarası1-2
DOI'lar
Yayın durumuYayınlandı - 28 Tem 2008
Harici olarak yayınlandıEvet

Finansman

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).

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

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