Abstract
β-Fe2O3 is the scarce polymorph of Fe 2O3 phases and is transformed easily into α-Fe 2O3 at high temperature. However, its crystal structure and the transformation mechanism to α-Fe2O3 are still unclear because of the difficulty in obtaining monophasic β-Fe 2O3 crystals. We established a synthesis method of the monophasic β-Fe2O3. It was synthesized by a two-step reaction: heating a mixture of Na2SO4 and Fe 2(SO4)3 in air at 250 C to form NaFe(SO 4)2, and subsequent heating the resultant phase with NaCl in air at 500 C. The crystal structure was refined to a bixbyite-type cubic structure (Ia3Ì...) with a = 9.4039(1) Å by the Rietveld method. Single crystalline β-Fe2O3 particles of approximately 1 μm in size were topotactically transformed into single α-Fe 2O3 crystals. Electron diffraction analysis revealed the crystallographic orientation relationships between β-Fe2O 3 and α-Fe2O3 to be [100] β//[0001]α, [010]β// [101Ì...0]α, and [001]β//[1Ì... 21Ì...0]α.
| Original language | English |
|---|---|
| Pages (from-to) | 770-774 |
| Number of pages | 5 |
| Journal | Crystal Growth and Design |
| Volume | 13 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 6 2013 |
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ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
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Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3 . / Danno, Teruaki; Nakatsuka, Daisuke; Kusano, Yoshihiro; Asaoka, Hiroshi; Nakanishi, Makoto; Fujii, Tatsuo; Ikeda, Yasunori; Takada, Jun.
In: Crystal Growth and Design, Vol. 13, No. 2, 06.02.2013, p. 770-774.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3
AU - Danno, Teruaki
AU - Nakatsuka, Daisuke
AU - Kusano, Yoshihiro
AU - Asaoka, Hiroshi
AU - Nakanishi, Makoto
AU - Fujii, Tatsuo
AU - Ikeda, Yasunori
AU - Takada, Jun
PY - 2013/2/6
Y1 - 2013/2/6
N2 - β-Fe2O3 is the scarce polymorph of Fe 2O3 phases and is transformed easily into α-Fe 2O3 at high temperature. However, its crystal structure and the transformation mechanism to α-Fe2O3 are still unclear because of the difficulty in obtaining monophasic β-Fe 2O3 crystals. We established a synthesis method of the monophasic β-Fe2O3. It was synthesized by a two-step reaction: heating a mixture of Na2SO4 and Fe 2(SO4)3 in air at 250 C to form NaFe(SO 4)2, and subsequent heating the resultant phase with NaCl in air at 500 C. The crystal structure was refined to a bixbyite-type cubic structure (Ia3Ì...) with a = 9.4039(1) Å by the Rietveld method. Single crystalline β-Fe2O3 particles of approximately 1 μm in size were topotactically transformed into single α-Fe 2O3 crystals. Electron diffraction analysis revealed the crystallographic orientation relationships between β-Fe2O 3 and α-Fe2O3 to be [100] β//[0001]α, [010]β// [101Ì...0]α, and [001]β//[1Ì... 21Ì...0]α.
AB - β-Fe2O3 is the scarce polymorph of Fe 2O3 phases and is transformed easily into α-Fe 2O3 at high temperature. However, its crystal structure and the transformation mechanism to α-Fe2O3 are still unclear because of the difficulty in obtaining monophasic β-Fe 2O3 crystals. We established a synthesis method of the monophasic β-Fe2O3. It was synthesized by a two-step reaction: heating a mixture of Na2SO4 and Fe 2(SO4)3 in air at 250 C to form NaFe(SO 4)2, and subsequent heating the resultant phase with NaCl in air at 500 C. The crystal structure was refined to a bixbyite-type cubic structure (Ia3Ì...) with a = 9.4039(1) Å by the Rietveld method. Single crystalline β-Fe2O3 particles of approximately 1 μm in size were topotactically transformed into single α-Fe 2O3 crystals. Electron diffraction analysis revealed the crystallographic orientation relationships between β-Fe2O 3 and α-Fe2O3 to be [100] β//[0001]α, [010]β// [101Ì...0]α, and [001]β//[1Ì... 21Ì...0]α.
UR - http://www.scopus.com/inward/record.url?scp=84873399868&partnerID=8YFLogxK
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U2 - 10.1021/cg301493a
DO - 10.1021/cg301493a
M3 - Article
AN - SCOPUS:84873399868
VL - 13
SP - 770
EP - 774
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 2
ER -