Corrosion Resistance in Co-Based Spinel Magnetocaloric Candidates
Disciplines
Inorganic Chemistry | Materials Chemistry
Abstract (300 words maximum)
Spinel-based materials are widely regarded as promising magnetocaloric materials for refrigeration technology due to their tunable structural and magnetic properties. Recently, newly explored breathing spinels, particularly sulfides and selenides, have emerged as potential next-generation magnetocaloric materials for low temperature applications owing to their highly frustrated magnetic nature enabling large entropy changes and low magnetic transition temperatures. However, the long-term viability of these materials in magnetic refrigeration devices depends not only on their magnetocaloric performance but also on their chemical stability under operational conditions. This study addresses two key aspects: (i) cryogenic temperature and magnetic field corrosion testing on Co-based spinel magnetocaloric candidates, and (ii) synthetic exploration of new cobalt-based breathing spinel materials. Cryogenic corrosion testing was conducted by immersing the materials in liquid nitrogen while the corrosion resistance under high magnetic fields was evaluated by exposing the materials to varying magnetic fields of up to 1 T. Structural and surface integrity were examined using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy before and after testing. This work not only advances the understanding of corrosion resistance in magnetocaloric spinels but also paves the way for the discovery of high-performance Co-based materials suitable for next-generation refrigeration technologies. Furthermore, the results of this study provide critical insights into their potential for long-term use in magnetocaloric cooling devices.
Academic department under which the project should be listed
CSM - Chemistry and Biochemistry
Primary Investigator (PI) Name
Madalynn Marshall
Corrosion Resistance in Co-Based Spinel Magnetocaloric Candidates
Spinel-based materials are widely regarded as promising magnetocaloric materials for refrigeration technology due to their tunable structural and magnetic properties. Recently, newly explored breathing spinels, particularly sulfides and selenides, have emerged as potential next-generation magnetocaloric materials for low temperature applications owing to their highly frustrated magnetic nature enabling large entropy changes and low magnetic transition temperatures. However, the long-term viability of these materials in magnetic refrigeration devices depends not only on their magnetocaloric performance but also on their chemical stability under operational conditions. This study addresses two key aspects: (i) cryogenic temperature and magnetic field corrosion testing on Co-based spinel magnetocaloric candidates, and (ii) synthetic exploration of new cobalt-based breathing spinel materials. Cryogenic corrosion testing was conducted by immersing the materials in liquid nitrogen while the corrosion resistance under high magnetic fields was evaluated by exposing the materials to varying magnetic fields of up to 1 T. Structural and surface integrity were examined using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy before and after testing. This work not only advances the understanding of corrosion resistance in magnetocaloric spinels but also paves the way for the discovery of high-performance Co-based materials suitable for next-generation refrigeration technologies. Furthermore, the results of this study provide critical insights into their potential for long-term use in magnetocaloric cooling devices.