Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3

Teruaki Danno, Daisuke Nakatsuka, Yoshihiro Kusano, Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Yasunori Ikeda, Jun Takada

Research output: Contribution to journalArticle

26 Citations (Scopus)

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 languageEnglish
Pages (from-to)770-774
Number of pages5
JournalCrystal Growth and Design
Volume13
Issue number2
DOIs
Publication statusPublished - Feb 6 2013

Fingerprint

phase transformations
Crystal structure
Phase transitions
Heating
Rietveld method
Crystals
crystal structure
heating
air
Air
Polymorphism
Electron diffraction
Crystal orientation
crystals
electron diffraction
Crystalline materials
synthesis
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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 journalArticle

Danno, T, Nakatsuka, D, Kusano, Y, Asaoka, H, Nakanishi, M, Fujii, T, Ikeda, Y & Takada, J 2013, 'Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3 ', Crystal Growth and Design, vol. 13, no. 2, pp. 770-774. https://doi.org/10.1021/cg301493a
Danno, Teruaki ; Nakatsuka, Daisuke ; Kusano, Yoshihiro ; Asaoka, Hiroshi ; Nakanishi, Makoto ; Fujii, Tatsuo ; Ikeda, Yasunori ; Takada, Jun. / Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3 In: Crystal Growth and Design. 2013 ; Vol. 13, No. 2. pp. 770-774.
@article{7207e89727b046aba7da4d72d54e50ca,
title = "Crystal structure of β-Fe2O3 and topotactic phase transformation to α-Fe2O3",
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 (Ia3{\`I}...) with a = 9.4039(1) {\AA} 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// [101{\`I}...0]α, and [001]β//[1{\`I}... 21{\`I}...0]α.",
author = "Teruaki Danno and Daisuke Nakatsuka and Yoshihiro Kusano and Hiroshi Asaoka and Makoto Nakanishi and Tatsuo Fujii and Yasunori Ikeda and Jun Takada",
year = "2013",
month = "2",
day = "6",
doi = "10.1021/cg301493a",
language = "English",
volume = "13",
pages = "770--774",
journal = "Crystal Growth and Design",
issn = "1528-7483",
publisher = "American Chemical Society",
number = "2",

}

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

UR - http://www.scopus.com/inward/citedby.url?scp=84873399868&partnerID=8YFLogxK

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 -