2005年
Preparation and characterization of al-substituted hematite and their tone color
NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)
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- 開始ページ
- 69
- 終了ページ
- 73
- 記述言語
- 英語
- 掲載種別
- 研究論文(国際会議プロシーディングス)
- 出版者・発行元
- AMER CERAMIC SOC
Hematite (alpha-Fe2O3) is one of the most primitive and attractive red pigments. The particle size of hematite seriously influences the reddish tone. The particle with the smallest size of about 100 nm had yellowish red color. With increasing the particle size, the tone color changed systematically from yellowish red to red, dark red, and dark purple. To control the tone color of hematite we prepared Al-substituted Hematite (alpha-(Fe1-xAlx)(2)O-3) by polymerized complex method using iron nitrate (Fe(NO3)(3)-9H(2)O) and aluminum nitrate (Al(NO3)(3)-9H(2)O) as starting materials. The precursors were heat-treated at the temperature between 500 degrees C and 1100 degrees C for 2 hours. When the samples were heat-treated at 1100 degrees C, the solubility limit of Al in hematite up to 13%. The particle size of the sample heat-treated at 1000 degrees C without Al substitution was about 2 pm, while the one with 10% Al-substitution was about 200 nm. The Al substitution suppressed the grain growth of hematite. With increasing the Al content, the temperature at which the color of hematite changed from yellowish red to dark purple increased monotonically. Moreover the Al-substitution seemed to stabilize the maghemite phase (gamma-Fe2O3) at higher temperature.. The XRD pattern of Al-substituted samples heat-treated at 700 degrees C showed some diffraction lines assigned to gamma-Fe2O3. This would be a reason to suppress the grain growth of hematite.
- リンク情報
- ID情報
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- Web of Science ID : WOS:000227460600012