One pot synthesis of exchange coupled Nd2Fe14B/alpha-Fe by pechini type sol-gel method.
In this work, a combination of nanoparticles of Nd2Fe14B hard magnetic phase and alpha-Fe soft magnetic phase were synthesized by one pot chemical synthesis technique using sol-gel method. A gel of Nd-Fe-B was prepared using NdCl3 x 6H2O, FeCl3 x 6H2O, H3BO3, citric acid, and ethylene glycol by pechini type sol-gel method. The gel was subsequently calcined and annealed to obtain the mixed oxide powders. The produced metal oxide particles were identified with XRD, SEM, TEM to obtain the crystal structure, shape and domain structure of them. The nanoparticles of mixed phase of Nd2Fe14B/alpha-Fe were obtained from these oxides by a process of reduction-diffusion in vacuum by employing CaH2 as reducing agent. During this process it was optimized by controlling temperature, reaction time and concentration of the reducing agent (CaH2). The phase formation of Nd2Fe14B was resulted by the direct diffusion of NdH2, Fe and B. The magnetic property of produced hard and soft phases was successfully identified with vibrating sample magnetometer (VSM). The mixed domains of the hard and soft phases were identified with selected area electron diffraction method (SAED) patterns.
Department of Chemistry, Sogang University, Seoul, 121-742, Republic of Korea.
Abid
A
Hussain
Abhijit P
AP
Jadhav
Yeon Kyung
YK
Baek
Hul Jin
HJ
Choi
Jaeho
J
Lee
Young Soo
YS
Kang
D001895:Boron / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004574:Electromagnetic Fields; D007501:Iron / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009354:Neodymium / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D013499:Surface Properties
D046911:Macromolecular Substances; D009354:Neodymium; D007501:Iron; D001895:Boron