Negative Thermal Expansion of Gd2Fe16.5Cr0.5 Compound with Th2Ni17-Type Structure

Yan Ming Hao; Fei Fei Liang; Xiao Hong He; Wu Yan Zhao; Yue Ting Qin; Fang Wang

doi:10.4028/www.scientific.net/AMR.299-300.47

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 299-300Negative Thermal Expansion of Gd2Fe16.5Cr0.5...

Negative Thermal Expansion of Gd₂Fe_16.5Cr_0.5 Compound with Th₂Ni₁₇-Type Structure

Abstract:

The thermal expansion and the Curie temperature of Gd₂Fe_16.5Cr_0.5 compound have been investigated by means of x-ray diffraction and magnetization measurements. The result shows that the Gd₂Fe_16.5Cr_0.5 compound annealed at 1243°C has a hexagonal Th₂Ni₁₇-type structure. Cr atom substituting for Fe atom can increase the Curie temperature obviously. In magnetic state, an anisotropic anomolous thermal expansion was observed. Along the c-axis, the average linear thermal expansion coefficient α_c=-2.79×10^-6/K in the temperature range 294-472K, and α_c =-3.09×10^-5/K in 472-592K. Along the a-axis, the average linear thermal expansion coefficient α_a =9.22×10^-6/K in 294-552K, and α_a =-1.41×10^-5/K in 552-592K. In the temperature range 472-592K, the average volume thermal expansion coefficient α_v =-2.14×10^-5/K. The mechanism of the thermal expansion anomaly of Gd₂Fe_16.5Cr_0.5 compound was discussed in this paper.

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Advanced Materials Research (Volumes 299-300)

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47-50

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https://doi.org/10.4028/www.scientific.net/AMR.299-300.47

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July 2011

Authors:

Yan Ming Hao, Fei Fei Liang, Xiao Hong He, Wu Yan Zhao, Yue Ting Qin, Fang Wang

Keywords:

Curie Temperature, Negative Thermal Expansion, X-Ray Diffraction (XRD)

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