Homogeneous solid-solution formation in Fe2O3-Al2O3 system observed by TEM, XAFS, and Mossbauer spectroscopy

被引：5

作者：

Nakaishi, Hayato ^{[1
]}

Yabutsuka, Takeshi ^{[1
]}

Yao, Takeshi ^{[2
]}

Kitao, Shinji ^{[3
]}

Seto, Makoto ^{[3
]}

Chen, Wen-Jauh ^{[4
]}

Shimonishi, Yuta ^{[5
]}

Yoshida, Shuhei ^{[5
]}

Takai, Shigeomi ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Energy Sci, Yoshida Honmachi,Sakyo Ku, Kyoto 6068501, Japan

[2] Kyoto Univ, Yoshida Honmachi,Sakyo Ku, Kyoto 6068501, Japan

[3] Kyoto Univ, Inst Integrated Radiat & Nucl Sci, Kumatori, Osaka 5900494, Japan

[4] Natl Yunlin Univ Sci & Technol, Grad Sch Mat Sci, Touliu 640, Yunlin, Taiwan

[5] DENSO Corp, Kariya, Aichi 4488661, Japan

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2023年 / 303卷

关键词：

Hematite; Corundum; Solid solution; Cation distribution; Magnetic properties; Mechanical alloying; X-RAY-DIFFRACTION; MAGNETIC-PROPERTIES; PHASE-TRANSITIONS; RIETVELD ANALYSIS; ELECTRON-DENSITY; IRON-OXIDE; HEMATITE; TEMPERATURE; ALPHA-FE2O3; PARTICLES;

D O I：

10.1016/j.matchemphys.2023.127764

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have characterized the mechanically alloyed (Fe2O3)1-x(Al2O3)x solid solution with corundum-type structure by means of TEM, EXAFS, and Mo center dot ssbauer spectroscopy emphasizing the homogeneity of cation distribution and the variation of magnetic property with the composition. HR-TEM revealed that the typical crystallite size of the solid solution is 10-20 nm and the observed lattice spacing is consistent with that evaluated from Vegard's law. EXAFS measurements showed that the radial distribution at Fe-Fe distance decreases monotonously with aluminum substitution, while Fe-O is not largely altered. Mo center dot ssbauer spectroscopy showed a gradual change in spectra from sextet peaks at x = 0 into doublet with increasing Al2O3 concentration up to x = 0.67, indicating that spin interaction is diluted by the homogeneous substitution of aluminum ions over the wide compositional range keeping corundum-type structure.

引用

页数：7

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