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S e p t e m b e r 2 4 - 2 6 , 2 0 1 8 | B u d a p e s t , H u n g a r y
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Magnetic Materials 2018
Materials Science and Nanotechnology
|
Volume 2
MAGNETISM AND
MAGNETIC MATERIALS
2
nd
International Conference on
Guillermo Pozo et al., Mater Sci Nanotechnol 2018, Volume 2
ELECTROCHEMICALLY SYNTHESIS
AND MAGNETIC PROPERTIES OF SPIN
TRANSITION COMPOUNDS
Guillermo Pozo
1
, P de la Presa
2,3
, R Prato
1
, P Marin
2,3
, J Fransaer
4
and
X Dominguez-Benetton
1
1
VITO-Flemish Institute for Technological Research, Belgium
2
Instituto de Magnetismo Aplicado, Spain
3
KU Leuven, Belgium
R
ecently, a third fundamental state for magnetism (besides ferromagnetism
and antiferromagnetism) was experimentally realized in a novel class
of matter: the spin-liquid state, which was only possible after finding a
way to synthesize herbertsmithite (ZnCu
3
(OH)
6
Cl
2
). Here we introduce an
electrochemically-driven method for synthesizing monodisperse nano-
particles of ZnxCu
4-x
(OH)6Cl
2
(in which x=1 for herbertsmithite, x=0 for
clinoatacamite and 0.33<x<1 for paratacamite) at room temperature (18°C).
The synthesis was carried out using a mixture of Cu
2+
and Zn
2+
ions as the
metal precursors and O
2
(in air) as the oxidant gas through a gas-diffusion
cathode. Zero-field-cooled (ZFC) and field-cooled (FC) mass magnetization
(M) in a field of 7.98 kA/m, over the temperature range of 2 to 300 K, showed
a small ferromagnetic ordering below Tc ~ 6 K that is accompanied by
bifurcation of FC data that are assigned to an impurity phase. There was
less difference between zero-field and field cooled susceptibility, when the
stoichiometric coefficient on the interlayer site was 1, which support a less
spin-glass behavior. We believe that the extracted ferromagnetic hysteresis at
T=2 K was caused by an impurity phase. As the purity of the herbertsmithite
nanoparticles is increased, a clear distinction of the quantum spin liquid state
is expected.
Guillermo Pozo has completed his PhD in Chemical
Engineering at the University of Queensland, Australia.
He is currently a Marie Curie Research fellow working
at the VITO-Flemish Institute for Technological Re-
search, Belgium.
guillermo.pozo@vito.beBIOGRAPHY