Crystallographic and magnetic properties of UFe5.8Al6.2 single crystals

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:189

Article

Goncalves, AP ; Estrela, P ; Waerenborgh, JC ; Paixao, JA ; Bonnet, M ; Spirlet, JC ; Godinho, M ; Almeida, M

关键词: ThMn12-type structure;    uranium intermetallics;    magnetic intermetallics;    actinides;    magnetic anisotropy;   

DOI  :  10.1016/S0304-8853(98)00253-4

来源: Elsevier

【 摘 要 】

Single crystals of UFe5.8Al6.2 were characterised by X-ray and neutron diffraction, Fe-57 Mossbauer spectroscopy and magnetisation. The structure refinement by X-ray and neutron diffraction shows a ThMn12-type structure, the Fe atoms fully occupying the 8f and partially occupying the 8j positions. Mossbauer spectra confirm these occupations and further indicate a magnetic ordering below 293 K. Magnetisation measurements show a ferromagnetic behaviour below 300 K, with a and b as easy directions and a spontaneous magnetisation of 10.4 mu(B)/f.u. at 5 K, due to the Fe occupation of 8j position. These single crystal results significantly differ from those previously obtained in UFe6Al6 polycrystalline samples obtained by melting and annealing. (C) 1998 Elsevier Science B.V. All rights reserved.

【 授权许可】

Free