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High-pressure transformation in the cobalt spinel ferrites

AutorBlasco, Javier; Subías, G.; García, Joaquín; Popescu, C.; Cuartero, Vera
Palabras clavePostspinel phase
Ferrite spinels
Pressure induced transformation
Irreversible transformation
Bulk modulus
Fecha de publicación2015
EditorElsevier
CitaciónJournal of Solid State Chemistry 221: 173-177 (2015)
ResumenWe report high pressure angle-dispersive x-ray diffraction measurements on CoxFe3−xO4 (x=1, 1.5, 1.75) spinels at room temperature up to 34 GPa. The three samples show a similar structural phase transformation from the cubic spinel structure to an analogous post-spinel phase at around 20 GPa. Spinel and post-spinel phases coexist in a wide pressure range (~20–25 GPa) and the transformation is irreversible. The equation of state of the three cubic spinel ferrites was determined and our results agree with the data obtained in related oxide spinels showing the role of the pressure-transmitting medium for the accurate determination of the equation of state. Measurements releasing pressure revealed that the post-spinel phase is stable down to 4 GPa when it decomposes yielding a new phase with poor crystallinity. Later compression does not recover either the spinel or the post-spinel phases. This phase transformation induced by pressure explains the irreversible lost of the ferrimagnetic behavior reported in these spinels.
Versión del editorhttps://doi.org/10.1016/j.jssc.2014.09.028
URIhttp://hdl.handle.net/10261/147721
DOI10.1016/j.jssc.2014.09.028
Identificadoresdoi: 10.1016/j.jssc.2014.09.028
issn: 0022-4596
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