PrFe2 rare earth giant magnetostrictive alloys and other effects of the spin reorientation

Nanjing University Professor Tang Shaolong research group Dr. Tang Yanmei steady magnetic field using the experimental device (SHMFF) X-ray diffraction equipment (XRD), carried out with cubic Laves phase structure PrFe2 alloys studied and achieved new progress, first reported PrFe2 rare earth giant magnetostrictive alloy and spin reorientation and other effects.

Theoretical predictions with PrFe2 Laves phase alloys at low temperatures (0K) has 5600ppm under the magnetostrictive effect, with potential applications. However, because of its single-phase crystal Laves phase synthesis difficult, and therefore has not been observed experimentally predicted theoretically huge magnetostrictive effect.
    
Nanjing University Research Group Professor Tang Shaolong a high pressure annealing method, has been synthesized PrFe1.9 Laves phase pure polycrystalline samples and Science Center, with a strong magnetic field variable temperature X-ray method, the magnetostrictive effect of the low depth study . Studies show that when a cubic Laves phase structure of the material occurs when the magnetostriction, will produce different structural distortion, the corresponding X-ray diffraction peaks will change. By PrFe1.9 cubic Laves phase alloys characteristic peaks {400} and {222} at different temperatures measured by X-ray diffraction spectra revealed that the alloy occurs between 70K to 300K rhombohedral structural distortion, while in 15K to 30K took place between tetragonal distortion. The experimental results show that as the temperature decreases, PrFe1.9 alloy spin reorientation occurs. Them through variable temperature X-ray diffraction methods, first reported polycrystalline PrFe1.9 giant magnetostrictive rare earth alloys as well as effects such as spin reorientation. Research published in the Journal of Applied Physics.
    
Strong magnetic Science Center X-ray diffraction can be cold, high temperature crystal structure of X-ray diffraction measurement, the temperature range of 12K-300K, high-temperature range of 300K-1700K, goniometer range of 0.1 ° to 140 °, angle resolution of 0.00001 °.


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