Abstract
SiCN magnetic ceramics doped with Fe ions were synthesized at different pyrolysis temperatures in the range from 600 to 1600°C. Several phases of ceramics were detected using the techniques of electron paramagnetic resonance/ferromagnetic resonance, Raman, Fourier-transform infrared and X-ray diffractometry, listed as follows: (a) transformation to the ceramic state from the polymer state, where the Fe ions are in the paramagnetic state, as the temperature is increased from 600 to 800°C; (b) formation of two different Fe species in the range of 950–1150°C: nanocrystalline particles in the ferromagnetic state and Fe ions incorporated into the free-carbon state in the superparamagnetic state; (c) diminution of the free-carbon content above 1150°C, and, as a consequence, diminution of the intensity of the broad Fe signal related to this phase; (d) appearance of a new Fe phase at about 1200°C; (e) disappearance of the ferromagnetic phase at about 1400°C; (f) disappearance of all Fe ions above 1530°C. The samples exhibiting superparamagnetic behavior are potentially useful in developing high-temperature magnetic sensor devices.
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Acknowledgments
We are grateful to Dr. T. Maris from Montreal University for recording X-ray patterns, Dr. S. Elouatik from Montreal University for recording Raman spectra and helpful discussions, and Dr. G. Kennedy from the SLOWPOKE Reactor laboratory of Ecole Polytecnique for neutron activation analysis of these samples. S.A. and I.S. are grateful for support from Consortium de Recherché et d’ Innovation en Aerospatiale au Quebec (CRIAQ) and Pratt and Whitney, Canada. S.K.M. is grateful for partial financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada.
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Andronenko, S.I., Stiharu, I., Menard, D. et al. EPR/FMR, FTIR, X-Ray and Raman Investigations of Fe-Doped SiCN Ceramics. Appl Magn Reson 38, 385–402 (2010). https://doi.org/10.1007/s00723-010-0120-5
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DOI: https://doi.org/10.1007/s00723-010-0120-5