Mössbauer spectroscopic study of a low temperature magnetic transition in ordered Fe-doped NiAl |
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| Authors: | Oswald N C Uwakweh C T Liu |
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| Institution: | 1. Department of Engineering Science and Materials, College of Engineering, University of Puerto Rico-Mayagüez, P.O. Box 9044, Mayagüez, Puerto Rico, 00681-9044
2. Department of Materials Science and Engineering, University of Tennessee, Knoxville Metals & Ceramics Division, Oak Ridge National Lab, One Bethel Valley Road, P.O. Box 2008, MS-6115, Oak Ridge, TN, 37831-6115, USA
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| Abstract: | Mössbauer spectroscopic (MS) measurements at ambient and cryogenic temperatures on powdered Fe-doped NiAl materials (Ni-40Al-9Fe and Ni-50Al-9Fe) exhibited paramagnetic behavior down to 17 K, with one Fe-site in the hosts. At 4.2 K, Ni-40Al-9Fe (Al deficient) remained paramagnetic, while Ni-50Al-9Fe (Ni deficient) displayed a magnetic transition, resolved in terms of one Fe environment. The internal magnetic field of the magnetically split site of Ni-50Al-9Fe was 185?±?8 kOe determined from a field distribution model. This shows that electronic and magnetic interactions in ordered Fe-doped NiAl depend on Fe site preference tendencies. The single Fe site observed at 4.2 K for the Ni-deficient alloy shows that its Fe distribution or site occupancy is not random but ordered. The interactions leading to the development of internal magnetic field in the Ni-deficient ordered alloy is temperature dependent being absent above 17 K based on MS measurements from ambient to 4.2 K. |
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