Structure and magnetic properties of nickel nanoparticles preparedby selective leaching

0454540 - FZÚ 2016 RIV NL eng J - Journal Article
Michalcová, A. - Svobodová, P. - Nováková, R. - Len, A. - Heczko, Oleg - Vojtěch, D. - Marek, I. - Novák, P.
Structure and magnetic properties of nickel nanoparticles preparedby selective leaching.
Materials Letters. Roč. 137, Dec (2014), s. 221-224. ISSN 0167-577X. E-ISSN 1873-4979
R&D Projects: GA ČR(CZ) GA14-03044S
Institutional support: RVO:68378271
Keywords : nanoparticles * magnetic materials * metals and alloys * route * size
Subject RIV: JG - Metallurgy
Impact factor: 2.489, year: 2014

In this study, we propose a novel method for preparation of nanocrystalline powder precursors for powder metallurgy processing. Nickel nanocrystalline powders were prepared by selective leaching of the Al-20Ni alloys in NaOH solution. The powders were studied by SEM, TEM, XRD, magnetometry and by small angle neutron scattering. The prepared powders had internal structure formed by grains of 5-50 nm in size depending on the leaching temperature. It was also proven that slight grain coarsening occurred during heating of particles at 40-80 degrees C for one hour. Magnetometry testing revealed significantly reduced magnetization of nanocrystalline nickel which is related to the internal structure. The results indicate that nickel powders prepared by selective leaching are suitable precursor for powder metallurgical preparation of bulk products with interesting physical and possible also mechanical properties.
Permanent Link: http://hdl.handle.net/11104/0255214