Apparent auxetic to non-auxetic crossover driven by Co2+ redistribution in CoFe2O4 thin films
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Título: | Apparent auxetic to non-auxetic crossover driven by Co2+ redistribution in CoFe2O4 thin films |
Autor/a: | Ferreiro Vila, Elías Iglesias Bernardo, Lucía Lucas del Pozo, Irene Varela Domínguez, Noa Bui, Cong Tinh Rivas Murias, Beatriz Vila Fungueiriño, José Manuel Jiménez Cavero, Pilar Magen, César Morellón, Luis Pardo Castro, Víctor Rivadulla Fernández, José Francisco |
Centro/Departamento: | Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares Universidade de Santiago de Compostela. Departamento de Física Aplicada Universidade de Santiago de Compostela. Departamento de Química Física |
Data: | 2019 |
Editor: | AIP Publishing |
Cita bibliográfica: | Ferreiro-Vila, E., Iglesias, L., Lucas del Pozo, I., Varela-Domínguez, N. et al. (2019). Apparent auxetic to non-auxetic crossover driven by Co2+ redistribution in CoFe2O4 thin films. "APL Materials", 7, 031109 |
Resumo: | Oxide spinels of general formula AB2O4 (A = Mg2+, Fe2+; B = Al3+, Cr3+, etc.) constitute one of the most abundant crystalline structures in mineralogy. In this structure, cations distribute among octahedral and tetrahedral sites, according to their size and the crystal-field stabilization energy. The cationic arrangement determines the mechanical, magnetic, and transport properties of the spinel and can be influenced by external parameters like temperature, pressure, or epitaxial stress in the case of thin films. Here, we report a progressive change in the sign of the Poisson ratio, ν, in thin films of CoFe2O4, defining a smooth crossover from auxetic (ν < 0) to non-auxetic (ν > 0) behavior in response to epitaxial stress and temperature. Microstructural and magnetization studies, as well as ab initio calculations, demonstrate that such unusual elastic response is actually due to a progressive redistribution of Co2+ among the octahedral and tetrahedral sites of the spinel structure. The results presented in this work clarify a long standing controversy about the magnetic and elastic properties of Co-ferrites and are of general applicability for understanding the stress-relaxation mechanism in complex crystalline structures. |
Versión do editor: | https://doi.org/10.1063/1.5087559 |
URI: | http://hdl.handle.net/10347/21351 |
DOI: | 10.1063/1.5087559 |
E-ISSN: | 2166-532X |
Dereitos: | © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/) |
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