Crystallographic and M¨ossbauer Studies of Sintered Nd-Fe-B Magnet
Crystallographic and M¨ossbauer Studies of Sintered Nd-Fe-B Magnet
Yong Hui Li(국민대학교); 임정태(국민대학교); 김철성(국민대학교); 안성용(삼성전기(주)); 최강룡(삼성전기(주)); 최문희(삼성전기)
62권 11호, 1641~1644쪽
초록
Nd-Ga-Febal.-Nb-B alloy with Nd2Fe14B structure was synthesized by using the strip casting method. The Nd-Ga-Febal.-Nb-B alloy retains the tetragonal structure with lattice constants a0= 8.802, and c0 = 12.215 ˚A. M¨ossbauer spectra were recorded at various temperatures ranging from 4.2 to 620 K. The Curie temperature (TC), and Debye temperature (ΘD) were determined to be TC = 613, and ΘD = 471.4 K, respectively. Each spectrum below TC was fitted with six subspectra of Fe sites (8j1, 8j2, 16k1, 16k2, 4c, and 4e) based on the occupancy of Fe ions probability distribution. The area ratios of subspectra at 4.2 K are 12.8, 12.8, 29.6, 29.1, 6.8,and 9.1%, respectively. The magnetic hyperfine fields (Hhf ) for the Fe sites decrease in the order Hhf (8j2) > Hhf (16k2) > Hhf (4c) > Hhf (16k1) > Hhf (8j1) > Hhf (4e).
Abstract
Nd-Ga-Febal.-Nb-B alloy with Nd2Fe14B structure was synthesized by using the strip casting method. The Nd-Ga-Febal.-Nb-B alloy retains the tetragonal structure with lattice constants a0= 8.802, and c0 = 12.215 ˚A. M¨ossbauer spectra were recorded at various temperatures ranging from 4.2 to 620 K. The Curie temperature (TC), and Debye temperature (ΘD) were determined to be TC = 613, and ΘD = 471.4 K, respectively. Each spectrum below TC was fitted with six subspectra of Fe sites (8j1, 8j2, 16k1, 16k2, 4c, and 4e) based on the occupancy of Fe ions probability distribution. The area ratios of subspectra at 4.2 K are 12.8, 12.8, 29.6, 29.1, 6.8,and 9.1%, respectively. The magnetic hyperfine fields (Hhf ) for the Fe sites decrease in the order Hhf (8j2) > Hhf (16k2) > Hhf (4c) > Hhf (16k1) > Hhf (8j1) > Hhf (4e).
- 발행기관:
- 한국물리학회
- 분류:
- 물리학