Synthesis and study of magnetic properties of Co-doped anatase TiO2nanoparticles

Yano, Shinya; Kurokawa, A.; Takeuchi, Hidenori; Yanoh, T.; Onuma, Kazuki; Takaya, Kenichi; Miike, K.; Miyasaka, Toshiki; Ichiyanagi, Yuko

doi:10.1088/1742-6596/433/1/012019

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…In particular, the Coulomb force causes a higher energy state in the crystal when Mn 3+ ions occupy B sites in the spinel structure, and as a result, the site degeneracy is decreased and the tetragonal structure of the octahedron is distorted by the Jahn-Teller effect [1][2][3][4][5][6][7]. We have prepared several types of magnetic oxide nanoparticles including 3d transition metals encapsulated in amorphous SiO 2 using our novel preparation method and reported on their magnetic properties [8][9][10][11][12][13][14][15]. Recently, we have produced cubic spinel Cu ferrite nanoparticles without Jahn-Teller distortion, even though tetragonal Cu ferrite is normally stable with Jahn-Teller distortion [16].…”

Section: Introductionmentioning

confidence: 99%

Local Structure Control of Manganese Oxide Nanoparticles Encapsulated by Amorphous SiO2

Miyasaka

Takaya

Miike

et al. 2014

e-J. Surf. Sci. Nanotechnol.

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Spinel-structured manganese oxide (M Mn2O4: M = Fe, Ni, Co, Zn) nanoparticles encapsulated in amorphous SiO2 were produced using our original wet chemical method. From the X-ray diffraction patterns, the diameters were estimated to range from 4 nm to 23 nm, depending on the annealing temperature. Bulk manganese oxide crystals are known to have the spinel structure, and a tetragonal structure with Jahn-Teller distortion is a stable and normal phase. This Jahn-Teller distortion is induced by Mn 3+ ions at the octahedral B sites. However, we have successfully produced cubic structures consisting of FeMn2O4, CoMn2O4, and NiMn2O4 nanoparticles in which the local distortion is suppressed. In order to clarify the local structure, X-ray absorption fine structure (XAFS) and magnetization measurements were performed. The cubic and tetragonal structures were selectively obtained, and their magnetic properties were investigated.

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