Formation mechanism of nano-crystalline β-Fe2O3 particles with bixbyite structure and their magnetic properties

T. Danno; H. Asaoka; M. Nakanishi; T. Fujii; Y. Ikeda; Y. Kusano; J. Takada

doi:10.1088/1742-6596/200/8/082003

Formation mechanism of nano-crystalline β-Fe₂O₃ particles with bixbyite structure and their magnetic properties

T. Danno, H. Asaoka, M. Nakanishi, T. Fujii, Y. Ikeda, Y. Kusano, J. Takada

Research output: Contribution to journal › Conference article › peer-review

14 Citations (Scopus)

Abstract

Formation mechanism of nano-crystalline β-Fe₂O₃ particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO₄)₂ to NaCl and heating treatment temperature. A single phase of β-Fe₂O₃ was formed regardless of the mixing ratio. The heat treatment temperature strongly affected the particle shapes and sizes. Below 490 °C, they had granular shape with a diameter of about 50 to 100 nm. While, above 490 °C, cubic particles with increased size of about 1 μm were produced. All samples were antiferromagnetic at low temperature. The Néel temperature (T _N) of 119 K for the large cubic particles was decreased to 113 K for the nanoparticles.

Original language	English
Article number	082003
Journal	Journal of Physics: Conference Series
Volume	200
Issue number	SECTION 8
DOIs	https://doi.org/10.1088/1742-6596/200/8/082003
Publication status	Published - Jan 1 2010

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Formation mechanism of nano-crystalline β-Fe2O3 particles with bixbyite structure and their magnetic properties",

abstract = "Formation mechanism of nano-crystalline β-Fe2O3 particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO4)2 to NaCl and heating treatment temperature. A single phase of β-Fe2O3 was formed regardless of the mixing ratio. The heat treatment temperature strongly affected the particle shapes and sizes. Below 490 °C, they had granular shape with a diameter of about 50 to 100 nm. While, above 490 °C, cubic particles with increased size of about 1 μm were produced. All samples were antiferromagnetic at low temperature. The N{\'e}el temperature (T N) of 119 K for the large cubic particles was decreased to 113 K for the nanoparticles.",

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AU - Danno, T.

AU - Asaoka, H.

AU - Nakanishi, M.

AU - Fujii, T.

AU - Ikeda, Y.

AU - Kusano, Y.

AU - Takada, J.

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AB - Formation mechanism of nano-crystalline β-Fe2O3 particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO4)2 to NaCl and heating treatment temperature. A single phase of β-Fe2O3 was formed regardless of the mixing ratio. The heat treatment temperature strongly affected the particle shapes and sizes. Below 490 °C, they had granular shape with a diameter of about 50 to 100 nm. While, above 490 °C, cubic particles with increased size of about 1 μm were produced. All samples were antiferromagnetic at low temperature. The Néel temperature (T N) of 119 K for the large cubic particles was decreased to 113 K for the nanoparticles.

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