Thin films of Co1.7Fe1.3O4 prepared by radio frequency sputtering – the first step towards their spinodal decomposition | Zendy

Thúc Minh Bùi | Zendy; H. Le Trong | Zendy; Lionel Presmanes | Zendy; Antoine Barnabé | Zendy; Corine Bonningue | Zendy; Philippe Tailhades | Zendy

Open Access

Thin films of Co_1.7Fe_1.3O₄ prepared by radio frequency sputtering – the first step towards their spinodal decomposition

Author(s) -

Thúc Minh Bùi,

H. Le Trong,

Lionel Presmanes,

Antoine Barnabé,

Corine Bonningue,

Philippe Tailhades

Publication year - 2014

Publication title -

crystengcomm

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.813

H-Index - 132

ISSN - 1466-8033

DOI - 10.1039/c3ce42588f

Subject(s) - spinodal decomposition , spinodal , annealing (glass) , sputtering , materials science , thin film , analytical chemistry (journal) , chemistry , crystallography , phase (matter) , nanotechnology , metallurgy , organic chemistry , chromatography

International audiencePure thin films of Co1.7Fe1.3O4 spinel iron cobaltites were prepared for the first time by radio frequency sputtering. Such films are made of small crystallites of about 20 to 30 nm in diameter. Because Co1.7Fe1.3O4 films have a composition located in the miscibility gap of Fe3O4-Co3O4, they can be submitted to spinodal transformation below about 900 °C. This transformation was also confirmed at 600 °C by X-ray diffraction and transmission electron microscopy studies. It was demonstrated however that this spinodal transformation occurs after only a few hours at low temperature. Indeed, after annealing in air at 300 to 450 °C for a few hours, the spinodal transformation leading to two-phase spinels, one rich in iron and the other rich in cobalt, was clearly revealed by Raman spectroscopy and electrical measurements

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