Structural evolution of FeCO3 through decarbonation at elevated temperatures

J. Wang, T. Sakakura, N. Ishizawa, H. Eba

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


The structural evolution of siderite (s), FeCO3, through decarbonation at elevated temperatures has been investigated by the in-situ single-crystal X-ray diffraction technique using an area detector. When the crystal was heated above 255 °C, the transparent crystal turned colour in faint black from surface, indicating that the decarbonation commenced. The spinel-type magnetite (m), Fe3O4, first appeared in coexistence with the FeCO3 parent crystal. The orientation relationship between the rhombohedral FeCO3 and the cubic Fe 3O4 can be described as [111]m // [001] s, and [2-1-1]m // [120]s. On further heating, additional diffraction spots appeared at 411 °C. They were indexed on the basis of the corundum-type hematite (h), (α-Fe2O3). The rhombohedral α-Fe2O3 unit cell had the same orientation relationship with the parent rhombohedral FeCO3 one, i.e., [001]h // [001]s, and [100]h // [100]s. On further heating the parent FeCO3 phase disappeared completely at 464 °C. The formation of iron oxides in FeCO 3 depended on not only temperature but also the holding time. The structural relationships among FeCO3, Fe3O4, and α-Fe2O3 are discussed.

Original languageEnglish
Article number022011
JournalIOP Conference Series: Materials Science and Engineering
Issue numberSYMPOSIUM 1
Publication statusPublished - 2011
Externally publishedYes
Event3rd International Congress on Ceramics, ICC3 - Osaka, Japan
Duration: 2010 Nov 142010 Nov 18

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)


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