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- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제18권 제3호
- 발행연도
- 2017.3
- 수록면
- 238 - 241 (4page)
- DOI
- http://dx.doi.org/
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초록· 키워드
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Cubic spinel NixMn3-xO4 (0.71 ≤ x ≤ 1) ceramics were prepared using the mixed-oxide method. The mixed powders wereinvestigated by TG-DSC analysis in order to study the phase formation and decomposition process. X-ray diffraction (XRD)and X-ray photoelectron spectroscopy (XPS) analysis were employed to determine the structural properties of the nickelmanganite specimens, especially the distribution of manganese ions. With an increase in nickel content, both Ni2+ and Mn3+ions predominately occupy the octahedral sites due to their preference for large octahedral site energy. The large FWHM valueof the Mn 2p signals of the NiMn2O4 spinel is indicative of multiplet splitting and the charging effect is due to the presenceof Mn2+, Mn3+ and Mn4+ ions. Manganese in all specimens exists in three oxidation states as Mn2+, Mn3+ and Mn4+ ions. Thelattice parameter estimated from XRD decreases with an increase in Ni content due to the replacement of larger ionic radii(Mn3+) by smaller ionic radii (Ni2+).
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