전기폭발법에 의해 제조된 자성 Fe2O3 나노 분말의 자기적 특성연구
(주)코리아스칼라
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- 2016.04.01
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- 2002.10
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서지정보
ㆍ발행기관 : 한국분말야금학회
ㆍ수록지정보 : 한국분말야금학회지 / 9권 / 5호
ㆍ저자명 : 엄영랑, 김흥회, 이창규
영어 초록
Nanoparticles of with a mean particle size of 4-30 nm have been prepared by a pulsed wire evaporation method, and its structural and magnetic properties were studied by SQUID magnetometer and Mossbauer spectroscopy. From the main peak intensity of XRD and absorption rate of Mossbauer spectrum, the amounts of and in as-prepared sample are about 70% and 30%, respectively. The coercivity (53 Oe) and the saturation magnetization (14 emu/g) are about 20% of those of the bulk . The low value of coercivity and saturation magnetization indicate that the phase nearly shows the spin glass-like behavior. Analysis of the set of Mossbauer spectrum indicates a distribution of magnetic hyperfine fields due to the particle size distribution yielding 20 nm of average particle size. The magnetic hyperfine parameters are consistent with values reported of bulk and . A quadrupole line on the center of spectrum represents of superparamagnetic phase of with a mean particle size of 7 nm or below.
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