Are magnetite (Fe3O4) films on MgAl2O4 auxetic?
M. Ziese
TL;DR
This study investigates the mechanical properties of Fe3O4 films on MgAl2O4 substrates, finding that these films are not auxetic and that Poisson's ratio measurement is reliable only for fully strained films.
Contribution
It provides the first detailed analysis of Poisson's ratio in Fe3O4 films on MgAl2O4, clarifying their auxetic behavior and measurement limitations.
Findings
Poisson's ratio = 0.3 along <100> direction
Fe3O4 films are not auxetic on MgAl2O4
Poisson's ratio measurement is reliable only for fully strained films
Abstract
Magnetite (Fe3O4) films were fabricated on MgAl2O4 (001) single crystal substrates by pulsed laser deposition. In-plane and out-of-plane lattice constants were determined by X-ray diffraction. The apparent Poisson's ratio was determined as the negative ratio of the out-of-plane to in-plane strains. The results show that (i) the determination of Poisson's ratio by this method is only reliable for fully strained films and (ii) Poisson's ratio = 0.3 along the <100> direction is positive for this archetypal ferrite. Fe3O4 films grown on MgAl2O4 (001) are not auxetic.
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Taxonomy
TopicsAluminum Alloys Composites Properties · Aluminum Alloy Microstructure Properties · Advanced ceramic materials synthesis