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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Phase transition from normal-to inverse-spinel structure has been observed for Fe_xCo_(3-x)O₄ thin films as the Fe composition (x) increases from 0 to 2. The samples were fabricated as thin films by sol-gel method on Si(100) substrates. X-ray diffraction measurements revealed a coexistence of two phases, normal and inverse spinel, for 0.76≤x≤0.93. The normal-spinel phase is dominant for x≤0.55 while the inverse-spinel phase for x≥1.22. The cubic lattice constant of the inverse-spinel phase is larger than that of the normal-spinel phase. For both phases the lattice constant increases with increasing x. X-ray photoelectron spectroscopy measurements revealed that both Fe²+ and Fe³+ ions exist with similar strength in the x=0.93 sample. Conversion electron Mossbauer spectra measured on the same sample showed that Fe²+ ions prefer the octahedral Co³+ sites, indicating the formation of the inverse-spinel phase. Analysis on the measured optical absorption spectra for the samples by spectroscopic ellipsometry indicates the dominance of the normal spinel phase for low x in which Fe³+ ions tend to substitute the octahedral sites.
목차
Abstract
Ⅰ. Introduction
Ⅱ. Experimental
Ⅲ. Results and Discussion
Ⅳ. Conclusion
References
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UCI(KEPA) : I410-ECN-0101-2009-428-015146411