J. Phys. Colloques
Volume 51, Numéro C4, Juillet 1990Multilayer Amorphisation by Solid-State-Reaction and Mechanical Alloying
|Page(s)||C4-299 - C4-305|
J. Phys. Colloques 51 (1990) C4-299-C4-305
KINETICS OF THE FORMATION OF AMORPHOUS Nd-Fe-B PARTICLES BY CHEMICAL REDUCTIONM.A. LÓPEZ QUINTELA1, J. RIVAS1, I. WINTER2 et W. KNOCHE2
1 Departments of Physical Chemistry and Applied Physics, University of Santiago de Compostela, SP-15706 Santiago de Compostela, Spain
2 Department of Physical Chemistry, University of Bielefeld, D-4800 Bielefeld 1, F.R.G.
Fine and ultrafine Nd-Fe-B particles have been obtained from metallic cation reduction by borohydride ions both in water and microemulsions. In this way amorphous particles of different sizes ranging from 4-50 nm to 100-400 nm can be obtained. In this work we will report on the kinetics of the growth of the particles studied by stopped-flow with UV-Vis detection. Quantum effects are suggested for the particles with sizes about 5 nm.