Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds

doi:10.1088/1674-1056/19/5/057501

Abstract The crystal structure, magnetic and magnetocaloric characteristics of the pseduo ternary compounds of Tb

_{5}

Ge

_{2 - x}

Si

_{2 - x}

Mn

_{2 x}

(0

\leq

2

x

\leq

0.1) were investigated by x-ray powder diffraction and magnetization measurements. The x-ray powder diffraction results show that all compounds preserve the monoclinic phase as the majority phase and all the synthesized compounds were observed to be ferromagnetic from magnetization measurements. Magnetic phase transitions were interpreted in terms of Landau theory. Maximum isothermal magnetic entropy change value (20.84 J

\cdot

kg

^{- 1}

\cdot

K

^{- 1}

) was found for Tb

_{5}

Ge

_{1.95}

Si

_{1.95}

Mn

_{0.1}

at around 123 K in the magnetic field change of 5 T.

Keywords: magnetic properties magnetocaloric effect isothermal magnetic entropy change

Received: 19 May 2009
Revised: 17 September 2009
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	61.05.cp	(X-ray diffraction)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	61.66.Dk	(Alloys )
	75.50.Cc	(Other ferromagnetic metals and alloys)

Fund: Project supported by the Scientific and Technological Research Council of Turkey under Project No. 104T382.

Cite this article:

E. Yüzüak, B. Emre, Y. Elerman, and A. Yücel Giant magnetocaloric effect in Tb₅Ge_2-xSi_2-xMn_2x compounds 2010 Chin. Phys. B 19 057501

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Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds

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Giant magnetocaloric effect in Tb₅Ge_2-xSi_2-xMn_2x compounds