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Exsolution of Nickel Nanoparticles from Mixed‐Valence Metal Oxides: A Quantitative Evaluation by Magnetic Measurements
Author(s) -
Tinti Victor B.,
Marani Debora,
Ferlauto Andre S.,
Fonseca Fabio C.,
Esposito Vincenzo,
Florio Daniel Z.
Publication year - 2020
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201900472
Subject(s) - materials science , lanthanum , ferromagnetism , nanoparticle , nickel , ceramic , metal , chromite , nickel oxide , analytical chemistry (journal) , condensed matter physics , metallurgy , nanotechnology , inorganic chemistry , chemistry , physics , chromatography
A fast and accurate experimental method is demonstrated to assess the fraction of exsolved metallic nanoparticles using magnetic measurements. As a benchmark, nanometric metallic nickel exsolved from (La 1− x Sr x )(Cr 1− y Ni y )O 3− δ is used for its high relevance as a solid oxide fuel cell component. The method is based on the difference in the magnetic response of the exsolved metallic nickel (ferromagnetic) and Sr‐doped lanthanum chromite ceramic matrix (paramagnetic). The exsolved nickel results in coherent nanoparticles pinned on the surface of the Sr‐doped lanthanum chromite ceramic matrix, as evidenced by electron microscopy analyses. The results obtained indicate the procedure as a fast and sensitive method to study the exsolution of ferromagnetic nanoparticles.