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Crystal Structure and Low Temperature Magnetic Properties of Melt - Spun Sm₂Co7B₃ Compound
양충진(C.J.Yang),최승덕(W.Y.Lee),이우영(S.D.Choi) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
Low temperature magnetic properties and crystal structures of melt-spun Sm₂Co_7B₃ compound were characterized. The magnetic measurements in the temperature range 77 K~450 K indicated that a spin-reorientation took place at about 150~160 K. A large anisotropy was observed(Ha = 135 kOe at 300 K, 725 kOe at 77 K) for Sm2Co7B3 although the magnetic moment is rather low. The crystal structure of the Sm₂Co_7B₃ compound was analyzed in detail by Rietveld analysis of powder diffraction pattern, and it was revealed that B(4h) atoms are not placed in the Sm(2e) layer but in between the Sm(2e) and Co(6i₁) layers.
합금조성에 따른 Nd - Fe - Co - B 및 Nd - Fe - Co - Zr - B계 본드자석의 자기특성
최승덕(S. D. Choi),이우영(W. Y. Lee),양충진(Choong Jin Yang) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
In compacting the melt-spun Nd₁₄Fe_(76)Co₄B_6 and Nd_(10.5)Fe_(79)Co₂Zr_(1.5)B_7 magnetic powders, the difference in composition induces a different behavior of closed packing rate as a function of aspect ratio of the powders. The Nd_(10.5)Fe_(79)Co₂Zr_(1.5)B_7 alloy having a low Co/Fe ratio (low density) shows the better green density to have an enhanced closed packing rate. An empirical power equation relating the green density with the compacting pressure was obtained such as p (g /㎤)=5.2~5.6×P^(0.045~0.065)(ton/㎠).<br/> The Nd₁₄Fe_(76)Co₄B_6 alloy having a high Nd/Fe ratio possesses much finer grain size(50~60 ㎚) than that of Nd_(10.5)Fe_(79)Co₂Zr_(1.5)B_7 alloy and shows the higher coercivity(iHc=14~15kOe). The higher Nd/Fe ratio in the melt-spun Nd-Fe-Co-B alloy, where the domain wall pinning mechanism was found to be predominant, assists the formation of Nd-rich grain boundary phase acting as a pinning site. The grain boundary ranges over 12~16 Å thick in the Nd-Fe-Co-B alloy while it ranges over 8~12 Å thick in the Nd-Fe-Co-Zr-B alloy.