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Updated: Jun 18, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
Published on: March 7, 2018
Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of
Diletta Giuntini1, Elisa Torresani2, Kyle T Chan3
1Institute of Advanced Ceramics, Hamburg University of Technology (TUHH) Denickestr. 15 D-21073 Hamburg Germany diletta.giuntini@tuhh.de.
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.
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