Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

Diletta Giuntini (1) , Elisa Torresani (2) , Kyle Chan (3) , Malte Blankenburg (4) , Lucien Saviot (5) , Büsra Bor (6) , Berta Domènech (7) , Meir Shachar (3) , Martin Müller (8) , Eugene Olevsky (3) , Javier Garay (3) , Gerold Schneider (1)

1 Technical University Hamburg Harburg [Hamburg]
2 SDSU - San Diego State University
3 UC San Diego - University of California [San Diego]
4 GKSS - Helmholtz-Zentrum Geesthacht
5 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
6 TUHH - Technische Universität Hamburg-Harburg
7 UAB - Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona
8 University of Alberta

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.

Domaines: Matériaux

Diletta Giuntini, Elisa Torresani, Kyle Chan, Malte Blankenburg, Lucien Saviot, et al.. Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials. Nanoscale Advances, 2019, 1 (8), pp.3139-3150. ⟨10.1039/C9NA00222G⟩. ⟨hal-02318541⟩