Abstract
Radiofrequency heating of magnetic particles promises highly efficient and direct heating of catalytic reactors for coupling of low carbon electricity with energy intensive chemical transformations. In this work, a novel real-time and in situ magnetometry method is developed to measure minor and major hysteresis loops of soft magnetic nanopowders. It is applied to measure the magnetic properties and hysteresis power absorption of magnetite and maghemite powders up to 500 °C. An arctangent model for saturation magnetization is adapted for minor hysteresis loops. It produces an excellent fit for hysteresis loop power across field strengths up to 18.5 kA m−1 and allows prediction of heating power, remanence, and susceptibility. Samples of magnetite and maghemite are shown to heat rapidly from room temperature at more than 25 °C s−1, with maghemite giving the strongest heating response. The peak heating power occurs at the transition beyond the ellipsoidal Rayleigh law region. These findings suggest that the properties of magnetic powders, coupled with variable magnetic field strengths and frequencies, can be tuned to optimize the heating power for a variety of applications.
Original language | English |
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Article number | 2102515 |
Number of pages | 13 |
Journal | Advanced Energy Materials |
Volume | 12 |
Issue number | 1 |
Early online date | 21 Nov 2021 |
DOIs | |
Publication status | Published - 6 Jan 2022 |
Bibliographical note
Funding Information:The authors gratefully acknowledge the Material and Chemical Characterisation Facility (MC2) at University of Bath for technical support and assistance in this work. This work was supported by the Engineering and Physical Sciences Research Council grant EP/L016354/1.
Data Availability Statement
The data that support the findings of this study are openly available in the University of Bath Research Data Archive (https://doi.org/10.15125/BATH-01084).
Funding
The authors gratefully acknowledge the Material and Chemical Characterisation Facility (MC2) at University of Bath for technical support and assistance in this work. This work was supported by the Engineering and Physical Sciences Research Council grant EP/L016354/1.
Keywords
- hysteresis
- hysteresis modeling
- induction heating
- maghemite
- magnetism
- magnetite
- magnetometry
- radiofrequency heating
- thermometry
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
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Dataset for "A Novel In Situ High-Temperature Magnetometry Method for Radiofrequency Heating Applications"
Noble, J. (Creator) & Hill, A. (Supervisor), University of Bath, 30 Nov 2021
DOI: 10.15125/BATH-01084
Dataset
Equipment
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Powder X-Ray Diffractometer (PXRD)
Material and Chemical Characterisation (MC2)Facility/equipment: Equipment
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Raman confocal microscope RENISHAM INVIA
Material and Chemical Characterisation (MC2)Facility/equipment: Equipment