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NdFe10.7TiM0.3(M = B, Ti)의 Mossbauer 연구
김철성(Chul Sung Kim),이용종(Young Jong Lee),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The authors have studied crystallographic and magnetic properties of NdFe_(10.7)TiM_(0.3)(M = B, Ti) by X-ray diffraction, VSM magnetometer, and Mossbauer spectrometer. The Alloys were prepared by arc-melting under argon atmosphere. The NdFe_(10.7)TiM_(0.3) has pure single phase, whereas the NdFe_(10.7)TiM_(0.3) contains some α-Fe, from powder X-ray diffractometry. The NdFe_(10.7)TiM_(0.3) has the ThMn₁₂-type tetragonal structure with α_0=8.587 A and C_0= 4.788 Å. The Curie temperature (Tc) is 570 ± 3 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 770 K. Each spectrum of below Tc was fitted with five subspectra of Fe sites in the structure (8i₁,8i₂, 8j₁, 8j₂ and 8f). The area fraction of the subspectra at room temperature are 16.4, 8.2, 14.8, 21.3 and 39.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8f)>Hhf(8f).
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NdFe10.7Ti1.3의 결정학적 및 자기적 성질 연구
이승화(Seung Wha Lee),이용종(Young Jong Lee),안성용(Sung Yong An),김철성(Chul Sung Kim),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
NdFe_(10.7)Ti_(1.3) has been studied with X-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometer(VSM). The alloys were prepared by arc-melting under an argon atmosphere. The NdFe_(10.7)Ti_(1.3) contains some α-Fe, from X-ray and Mossbauer measurements. The NdFe_(10.7)Ti_(1.3) has the ThMn₁₂-type tetragonal structure with α_0=8.607 Å and c_0=4.790 Å. The Curie temperature(Tc) of the NdFe_(10.7)Ti_(1.3) is 590 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 800 K. Each spectrum below Tc was fitted with six subspectra of Fe sites in the structure(8i₁, 8i₂, 8j₂, 8j₁, 8f and α-Fe). The area fractions of the subspectra at room temperature are 13.8 %, 15.4 %, 17 %, 16.4 %, 34.1 % and 3.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8j)>Hhf(8f). The abrupt changes in the magnetic hyperfine field, isomer shift and magnetic moment observed at about 180 K in NdFe_(10.7)Ti_(1.3) are attributed to spin reorientation.
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