Mossbauer studies of melt-spun Nd-Fe-Ti-Mo-N alloy

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NdFe_<10.7>Ti_<1.2>Mo_<0.1>N_δ alloys have been studied with x-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometer (VSM). NdFe_<10.7>Ti_<1.2>Mo_<0.1> alloy was prepared by arc-melting in an argon atmosphere. Nitrogenation was performed by heating the alloy powder in pure N_2 at 500℃ for 15min. NdFe_<10.7>Ti_<1.2>Mo_<0.1>N_δ has a ThMn_<12>-type structure with a_0=8.643 Å and c_0=4.819 Å, contains some α-Fe precipitation confirmed with x-ray diffractometry and Mossbauer measurements. The Curie temperature (T_c) is 675K±3K. Mossbauer spectroscopy was performed at various temperatures ranging from 13 to 800K and each spectrum below T_c is fitted with six subspectra of Fe sites in the structure (8i_1, 8i_2, 8j_2, 8j_1, 8f and α-Fe). The area fractions of the subspectra at 13 K were 9.2, 5.9, 11.4, 10.7, 38.8 and 24%, respectively. The magnetic hyperfine fields for the Fe sites decrease in the order, H_<hf>(8i)>H_<hf>(8j)>H_<hf>(8f). The Debye temperatures of NdFe_<10.7>Ti_<1.2>Mo_<0.1> and NdFe_<10.7>Ti_<1.2>Mo_<0.1>N_δ were found to be 〓=340±5K and 〓=432±5K, respectively.
社団法人日本磁気学会の論文
1999-01-20