TY - JOUR
T1 - Cation distribution and valence state in Mn- Zn ferrite examined by synchrotron X-rays
AU - Sakurai, Syoichi
AU - Sasaki, Satoshi
AU - Okube, Maki
AU - Ohara, Hiroki
AU - Toyoda, Takeshi
N1 - Funding Information:
This study was performed in part under the auspices of the Photon Factory (PAC nos. 2005G124 and 2005G131). This work was supported in part by a Grant in Aid for the Scientific Research (16080103-440-A01) provided by the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2008/10/1
Y1 - 2008/10/1
N2 - Cation distribution and valence state in manganese zinc ferrite have been investigated with the synchrotron X-rays, where the two-wavelengths anomalous dispersion (TWAD) technique of X-ray diffraction was used at wavelengths of 1.7535 and 1.2934 Å for Fe K and Zn K absorption edges, respectively. The result shows that a single crystal of Mn0.80Zn0.18Fe 2.02O4 grown at T = 1373 K has an inverse-spinel ingredient, where 11% of Mn and 44% of Zn ions occupy the octahedral B sites of spinel ferrite. The cation distribution is quite different from that of manganese zinc ferrite manufactured, which was synthesized at T = 1873 K and has a typical normal-spinel structure. The chemical shifts in Mn K, Zn K and Fe K X-ray absorption near-edge structure (XANES) spectra support that only Mn 2+, Zn2+ and Fe3+ ions exist in the manganese zinc ferrite. From a combination study of XANES and X-ray magnetic circular dichroism (XMCD) spectroscopy at the Mn K edge, it is suggested that Mn 2+ ions occupy both tetrahedral A and octahedral B sites. The chemical formula determined in this study is described as (Mn 0.712+Zn0.102+Fe0.19 3+) [Mn0.092+Zn0.08 2+Fe1.833+]O4.
AB - Cation distribution and valence state in manganese zinc ferrite have been investigated with the synchrotron X-rays, where the two-wavelengths anomalous dispersion (TWAD) technique of X-ray diffraction was used at wavelengths of 1.7535 and 1.2934 Å for Fe K and Zn K absorption edges, respectively. The result shows that a single crystal of Mn0.80Zn0.18Fe 2.02O4 grown at T = 1373 K has an inverse-spinel ingredient, where 11% of Mn and 44% of Zn ions occupy the octahedral B sites of spinel ferrite. The cation distribution is quite different from that of manganese zinc ferrite manufactured, which was synthesized at T = 1873 K and has a typical normal-spinel structure. The chemical shifts in Mn K, Zn K and Fe K X-ray absorption near-edge structure (XANES) spectra support that only Mn 2+, Zn2+ and Fe3+ ions exist in the manganese zinc ferrite. From a combination study of XANES and X-ray magnetic circular dichroism (XMCD) spectroscopy at the Mn K edge, it is suggested that Mn 2+ ions occupy both tetrahedral A and octahedral B sites. The chemical formula determined in this study is described as (Mn 0.712+Zn0.102+Fe0.19 3+) [Mn0.092+Zn0.08 2+Fe1.833+]O4.
KW - Anomalous dispersion
KW - Cation distribution
KW - Mn-Zn ferrite
KW - Resonant X-ray scattering
KW - Site occupancy
KW - Valence state
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U2 - 10.1016/j.physb.2008.05.035
DO - 10.1016/j.physb.2008.05.035
M3 - Article
AN - SCOPUS:55349093918
SN - 0921-4526
VL - 403
SP - 3589
EP - 3595
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 19-20
ER -