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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2023.9
- 수록면
- 239 - 244 (6page)
- DOI
- 10.4283/JMAG.2023.28.3.239
이용수
초록· 키워드
오류제보하기
ε-Fe<SUB>2</SUB>O<SUB>3</SUB> has received attention with particular interest because of its large coercive field at room temperature, high-frequency millimeter-wave absorption, and the coupling of its magnetic and dielectric properties. This work investigated the effect of heat treatment on the formation of ε-Fe<SUB>2</SUB>O<SUB>3</SUB>/SiO<SUB>2</SUB> composites fabricated using reverse-micelle and sol-gel methods. The heating process was performed at various temperatures to figure out the optimal conditions for acquisition of the ε-Fe<SUB>2</SUB>O<SUB>3</SUB> phase, which exhibits the largest coercive field among the Fe oxides. The sample treated at 1,075 °C had the highest percentage of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> phase, with a coercivity (HC) of 21.57 kOe measured at room temperature that reached a maximum of 23.7 kOe at 230 K. The measurement of the magnetization-temperature (M-T) curve for this sample also reveals the characteristic magnetic transition associated with ε-Fe<SUB>2</SUB>O<SUB>3</SUB> within the temperature range of 40-150 K. The crystal structure of ε-Fe<SUB>2</SUB>O<SUB>3</SUB> was confirmed using X-ray powder diffraction. Transmission electron micrographs revealed a broad size distribution of iron oxide nanoparticles ranging from 12 to 22 nm. The findings indicate that ε-Fe<SUB>2</SUB>O<SUB>3</SUB> is a promising candidate with high electromagnetic-wave absorption capacity that is appropriate for high-speed wireless communication applications.
목차
1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusion
References
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