| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Thermal Expansion Anomaly and Spontaneous Magnetostriction of Y2Fe14Al3 Compound |
| HAO Yan-Ming1, ZHANG Yan-Yan2, JIANG Xin-Yuan1, GAO Chun-Jing1, WU Yan-Zhao1 |
| 1College of Science, Tianjin University of Science and Technology, Tianjin 3002222School of Mathematics Science, Tianjin Normal University, Tianjin 300384 |
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| Cite this article: |
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HAO Yan-Ming, ZHANG Yan-Yan, JIANG Xin-Yuan et al 2009 Chin. Phys. Lett. 26 026501 |
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Abstract The structure and magnetic properties of Y2Fe14Al3 compound are investigated by means of x-ray diffraction and magnetization measurements. The Y2Fe14Al3 compound has a hexagonal Th2Ni17-type structure. Negative thermal expansion is found in Y2Fe14Al3 compound in the temperature range from 403 to 491K by x-ray dilatometry. The coefficient of the average thermal expansion is -α=-2.54 ×10-5K-1. The spontaneous magnetostrictive deformations from 283 to 470K are calculated by means of the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation ωS decreases from 5.74×10-3 to nearly zero with temperature increasing from 283 to 470K, the spontaneous linear magnetostrictive deformation λc along the c-axis is larger than the spontaneous linear magnetostrictive deformation λa in basal-plane in the same temperature below 350K.
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| Keywords:
65.60.+a
75.80.+q
75.30.Et
75.60.Ej
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Received: 16 November 2008
Published: 20 January 2009
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| PACS: |
65.60.+a
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(Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.)
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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75.30.Et
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(Exchange and superexchange interactions)
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75.60.Ej
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(Magnetization curves, hysteresis, Barkhausen and related effects)
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