Negative Thermal Expansion of Tm2Fe15SiCr Compound

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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.

Info:

Periodical:

Advanced Materials Research (Volumes 311-313)

Edited by:

Zhongning Guo

Pages:

764-767

DOI:

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

Citation:

F. F. Liang et al., "Negative Thermal Expansion of Tm2Fe15SiCr Compound", Advanced Materials Research, Vols. 311-313, pp. 764-767, 2011

Online since:

August 2011

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Price:

$35.00

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