Magnetic and thermal properties of amorphous Al-Gd-TM (TM=Fe, Cu) alloys

✍ Scribed by R. A. Dunlap; V. Srinivas; G. Beydaghyan; M. E. McHenry

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 384 KB
• Volume: 28
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00354691

✦ Synopsis

Amorphous aluminium-transition metal-rare earth alloys (AI-RE-TM) with compositions AI6~Gd15Cu2o and All Gdl Fel have been prepared by melt spinning. X-ray diffraction studies show the average interatomic spacing in these alloys to be about 7% greater than in fcc aluminium and about 20% greater than in amorphous AI TM-Si alloys. Thermal analysis measurements of the AI65Gd~ 5Cu2o and All Gdl Fel alloys show the crystallization temperatures to be 647 and 945 K, respectively. Magnetization studies show AI66Gd~ 5Cu=o to be paramagnetic with a localized gadolinium moment of 8.0 ___ 0.2 Pg' AI~ Gdl Fe~ shows ferromagnetic behaviour, with Tc = 275 K and a saturation magnetization of 124 e.m.u.g-~. A room-temperature 57Fe M6ssbauer spectrum of AI~ Gdl Fel shows a well-defined quadrupole doublet with a mean splitting of about 0.4 mms -~ . At 77 K, the M6ssbauer spectrum shows a well-resolved sextet, corresponding to a mean iron hyperfine field of 96 kOe.