The influence of gallium on the magnetocaloric properties of Gd5Si2Ge2

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

doi:10.1016/j.jallcom.2007.06.060

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 journal › Article › peer-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(Si_2-xGe_2-x)Ga_2x 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 language	English
Pages (from-to)	94-98
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	460
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2007.06.060
Publication status	Published - 28 Jul 2008
Externally published	Yes

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).

Funders	Funder number
DGICyT
Forshungszentrum Jülich	WTZ TUR 04/011
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu	104T382
Comisión Interministerial de Ciencia y Tecnología	MAT2004-1291

Keywords

Entropy change
Intermetallic compounds
Magnetocaloric effect

Access to Document

10.1016/j.jallcom.2007.06.060

Cite this

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title = "The influence of gallium on the magnetocaloric properties of Gd5Si2Ge2",

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.",

keywords = "Entropy change, Intermetallic compounds, Magnetocaloric effect",

author = "Seda Aksoy and Atila Yucel and Yalcin Elerman and Thorsten Krenke and Mehmet Acet and Xavier Moya and Llu{\'i}s Ma{\~n}osa",

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AU - Aksoy, Seda

AU - Yucel, Atila

AU - Elerman, Yalcin

AU - Krenke, Thorsten

AU - Acet, Mehmet

AU - Moya, Xavier

AU - Mañosa, Lluís

PY - 2008/7/28

Y1 - 2008/7/28

N2 - 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.

AB - 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.

KW - Entropy change

KW - Intermetallic compounds

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