Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials
Open Access
- 2 July 2019
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale Advances
- Vol. 1 (8), 3139-3150
- https://doi.org/10.1039/c9na00222g
Abstract
Nanostructured iron-oxide based materials with tailored mechanical and magnetic behavior are produced in bulk form. By applying ultra-fast heating routines via spark plasma sintering (SPS) to supercrystalline pellets, materials with an enhanced combination of elastic modulus, hardness and saturation magnetization are achieved. Supercrystallinity – namely the arrangement of the constituent nanoparticles into periodic structures – is achieved through self-assembly of the organically-functionalized iron oxide nanoparticles. The optimization of the following SPS regime allows the control of organics' removal, necking, iron oxide phase transformations and nano-grain size retention, and thus the fine-tuning of both mechanical properties and magnetic response, up until the production of bulk mm-size superparamagnetic materials.Keywords
Funding Information
- Deutsche Forschungsgemeinschaft (192346071)
- U.S. Department of Energy (DE-SC0008581)
- Alexander von Humboldt-Stiftung
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