Negative Thermal Expansion of Tm2Fe15SiCr Compound

Fei Fei Liang; Yan Ming Hao; Yan Zhao Wu

doi:10.4028/www.scientific.net/AMR.311-313.764

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 311-313Negative Thermal Expansion of Tm2Fe15SiCr Compound

Negative Thermal Expansion of Tm₂Fe₁₅SiCr Compound

Abstract:

The thermal expansion and the Curie temperature of Tm₂Fe₁₅SiCr compound have been investigated by means of x-ray diffraction and magnetization measurements. The result shows that the Tm₂Fe₁₅SiCr compound has a hexagonal Th₂Ni₁₇-type structure. One Cr and one Si atoms substituting for two Fe atoms can increase the Curie temperature obviously. In magnetic state, an anisotropic anomalous thermal expansion was observed. Along the c-axis, the average linear thermal expansion coefficient αc=-2.04×10^-5/K in the temperature range 303-460K. Along the a-axis, the average linear thermal expansion coefficient αa=-8.09×10^-5/K in 370-410K. In the temperature range 370-450K, the average volume thermal expansion coefficient αv =-2.08×10^-5/K. The mechanism of the thermal expansion anomaly of Tm2Fe15SiCr compound was discussed in this paper.

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Advanced Materials Research (Volumes 311-313)

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764-767

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https://doi.org/10.4028/www.scientific.net/AMR.311-313.764

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August 2011

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Fei Fei Liang, Yan Ming Hao, Yan Zhao Wu

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

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