Ferromagnetic properties and Nanocrystallization behavior of Amorphous (Fe 0.99 Mo 0.01 ) 78 Si 9 B 13 Ribbons
- PDF / 464,491 Bytes
- 6 Pages / 595 x 842 pts (A4) Page_size
- 12 Downloads / 209 Views
Ferromagnetic properties and Nanocrystallization behavior of Amorphous (Fe0.99Mo0.01)78Si9B13 Ribbons
Xiang-Cheng Sun1,*, J. A. Toledo1, S. Galindo2 and W. S. Sun3 1
Prog. Molecular Simulation, Instituto Mexicano del Petroleo, Lazaro Cardenas 152#, 07730, * D.F. Mexico E-mail: [email protected]; Fax: +525-3336239 2 ININ , Km.36.5, Carr. Mexico-Toluca, C.P.52045, Edo. de Mexico, Mexico. 3 Institute of Metal Research, CAS, Shenyang, 110015, P. R. China
ABSTRACT Ferromagnetic properties and nanocrystallization process of soft ferromagnetic (Fe0.99Mo0.01)78Si9B13 ribbons are studied by transmission electron microscope (TEM), X-ray diffraction (XRD), Mössbauer spectroscopy (MS), differential scanning calorimeters (DSC) and magnetization measurements. The Curie and crystallization temperature are determined to be TC=665K and Tx = 750K, respectively. The Tx value is in well agreement with DSC measurement results. X-ray diffraction patterns had shown a good reconfirm of two metastable phases (Fe23B6, Fe3B) were formed under in-situ nanocrystallization process. Of which these metastable phases embedded in the amorphous matrix have a significant effect on magnetic ordering. The ultimate nanocrystalline phases of α-Fe (Mo, Si) and Fe2B at optimum annealing temperature had been observed respectively. It is notable that the magnetization of the amorphous phase decreases more rapidly with increasing temperature than those of nanocrystalline ferromagnetism, suggesting the presence of the distribution of exchange interaction in the amorphous phase or high metalloid contents. INTRODUCTION The very good promising bulk soft magnetic nanocrystalline (NC) materials, FeSiB based Finemet---are two phase alloys consisting of very fine BCC solid solution grains (typically with a diameter of about 10-15nm) embedded in a remaining amorphous matrix [15]. Yoshizawa [4] and co-workers revealed that the presence of small additions of Cu and Nb to some FeSiB-based alloys could allow the creation of two-phase materials by the devitrification, which showed superior soft magnetic properties. This effect was caused by the homogeneous precipitation of bcc α-Fe(M) nanocrystals embedded in the ferromagnetic amorphous matrix. Moreover, the addition of Cu, Nb had great influence on the formation of nanocrystalline materials by changing the crystallization behavior [3]. It can be expected that, study of crystallization of Fe-based metallic glasses containing transitional element additives will also benefit the development of new types of materials. In the present work, by using transmission electron microscopy (TEM), differential scanning calorimeters (DSC), and X-ray diffraction (XRD), a study on nanocrystallization behavior had been carried out for (Fe0.99Mo0.01)78Si9B13 amorphous ribbons with a little amount of Mo element. Furthermore, intrinsic ferromagnetic properties were also studied using Mössbauer spectroscopy (MS) and vibrating sample magnetometer (VSM) techniques.
U1.3.1
EXPERIMENT Amorphous (Fe0.99Mo0.01)78Si9B13 (at%) alloy ribbons of 30mm width
Data Loading...
