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Topochemical Approach for Transition-Metal Exchange Assisted by Copper Extrusion: from Cu2FeBO5 to Fe3BO5
journal contribution
posted on 2017-02-17, 13:18 authored by Christine Martin, Antoine Maignan, Anne Guesdon, Fabien Lainé, Oleg I. LebedevAll fields of today’s technology
are concerned with multifunctional materials, the subject of constantly
expanding research. Among them, metal transition oxides occupy a strategic
place because of the properties directly correlated with metal valence
linked with oxygen stoichiometry. To enhance or induce new properties,
knowledge of the relationships between the structural and physical
characteristics is of prime importance, but a design at low scale
also appears to be a powerful tool to increase the chemical reactivity
and stabilize new compounds. Herein, an unexpected reaction is reported
that associates the exchange of copper and iron in a 3D ludwigite
lattice with the huge release of oxygen (14% by weight) at moderate
temperature (<450 °C). Annealing of Cu2FeBO5 in a reducing atmosphere leads to the extrusion of copper
and the formation of Fe3BO5, the micro/nanostructural
state of which facilitates the partial Cu2FeBO5 recovery associated with the capture of oxygen in oxidizing conditions.