Permanent magnets (TM) are key components of the green transition. They play a central role in renewable and sustainable energy and mobility. The highest performing TMs are based on rare earth elements (REEs), while the lower performing TMs are ferritic. However, due to supply risk and price volatility, as well as their harmful impact on the environment, REEs represent a certain level of risk and drive the search for alternatives.
In this context, ferrites are one of the most commonly used magnetic materials for permanent magnets, primarily due to their low cost, good availability, and wide range of applications. This thesis aims to optimize the synthesis of W-type hexaferrites (SrZn$_2$Fe$_{16}$O$_{27}$), and their densification. SrZn$_2$Fe$_{16}$O$_{27}$ was synthesized by the sol-gel method, followed by calcination at various temperatures and durations. We densified powders with the best properties using the pressureless spark plasma sintering (p-SPS) and conventional sintering method. We determined the phase composition of the synthesized and calcined powders and pellets after densification, analysed the microstructure and magnetic properties.
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