Structural properties and cation distribution in a NixMn3-xO4 (0.71 ≤ x ≤ 1.0) spinel
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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+).
Abstract
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+).
참고문헌 (12)
- G. Blasse, , Philips Res. Rep, 19, pp.3~ (1964)
- V.A.M. Brabers, , Phys. Status Solidi A, 69, pp.325~ (1982)
- A.B. Devale, , J. Phys. C: Solid State Phys, 15, pp.899~ (1982)
- B. Gillot, , Mater. Chem. Phys, 24, pp.199~ (1989)
- D.S. Erickson, , J. Solid State Chem, 59, pp.42~ (1985)
- J.C. Carver, , J. Chem. Phys, 57, pp.973~ (1972)
- S. Asrink, , J. Phys. Chem. Solids, 58, pp.725~ (1997)
- Q.M. Wei, , J. Mat. Sci, 36, pp.5115~ (2001)
- N. Najmoddin, , Ceram. Int, 40, pp.3619~ (2014)
- A.A. Yonsif, , Journal of Physics: Cond. Matter, 6, pp.5717~ (1994)
- M.A. Amer, , Physica Status Solid A, 181, pp.539~ (2000)
- M.A. Amer, , Physica Status Solidi A, 237, pp.459~ (2003)