Doping γ-Fe2O3 nanoparticles with Mn(III) suppresses the transition to the α-Fe2O3 structure

Jriuan Lai, Kurikka V P M Shafi, Katja Loos, Abraham Ulman, Yongjae Lee, Thomas Vogt, Claude Estournès

Research output: Contribution to journalArticle

Abstract

Here we report on a mixed oxide system, γ-Fe2O3 nanoparticles doped with Mn(III), where the transition from the cubic to the more stable hexagonal α-Fe2O3 structure is suppressed. When amorphous Fe2O3 is heated at 300 °C for 3 h, ferrimagnetic γ-Fe2O3 is observed as the sole product. On the other hand, when the temperature is raised to 500 °C, one observes only antiferromagnetic α-Fe2O3 as the product. However, upon doping with 8.5 wt % Mn(III), the amorphous nanoparticles crystallized to mainly the γ-Fe2O3 matrix after heating at 500 °C for 3 h, and need to be heated to >650 °C for the complete transition to the α-Fe2O3 structure to take place.

Original languageEnglish (US)
Pages (from-to)11470-11471
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number38
DOIs
StatePublished - Sep 24 2003

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Nanoparticles
Doping (additives)
Heating
Oxides
Temperature

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Doping γ-Fe2O3 nanoparticles with Mn(III) suppresses the transition to the α-Fe2O3 structure. / Lai, Jriuan; Shafi, Kurikka V P M; Loos, Katja; Ulman, Abraham; Lee, Yongjae; Vogt, Thomas; Estournès, Claude.

In: Journal of the American Chemical Society, Vol. 125, No. 38, 24.09.2003, p. 11470-11471.

Research output: Contribution to journalArticle

Lai, Jriuan ; Shafi, Kurikka V P M ; Loos, Katja ; Ulman, Abraham ; Lee, Yongjae ; Vogt, Thomas ; Estournès, Claude. / Doping γ-Fe2O3 nanoparticles with Mn(III) suppresses the transition to the α-Fe2O3 structure. In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 38. pp. 11470-11471.
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abstract = "Here we report on a mixed oxide system, γ-Fe2O3 nanoparticles doped with Mn(III), where the transition from the cubic to the more stable hexagonal α-Fe2O3 structure is suppressed. When amorphous Fe2O3 is heated at 300 °C for 3 h, ferrimagnetic γ-Fe2O3 is observed as the sole product. On the other hand, when the temperature is raised to 500 °C, one observes only antiferromagnetic α-Fe2O3 as the product. However, upon doping with 8.5 wt {\%} Mn(III), the amorphous nanoparticles crystallized to mainly the γ-Fe2O3 matrix after heating at 500 °C for 3 h, and need to be heated to >650 °C for the complete transition to the α-Fe2O3 structure to take place.",
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AU - Loos, Katja

AU - Ulman, Abraham

AU - Lee, Yongjae

AU - Vogt, Thomas

AU - Estournès, Claude

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AB - Here we report on a mixed oxide system, γ-Fe2O3 nanoparticles doped with Mn(III), where the transition from the cubic to the more stable hexagonal α-Fe2O3 structure is suppressed. When amorphous Fe2O3 is heated at 300 °C for 3 h, ferrimagnetic γ-Fe2O3 is observed as the sole product. On the other hand, when the temperature is raised to 500 °C, one observes only antiferromagnetic α-Fe2O3 as the product. However, upon doping with 8.5 wt % Mn(III), the amorphous nanoparticles crystallized to mainly the γ-Fe2O3 matrix after heating at 500 °C for 3 h, and need to be heated to >650 °C for the complete transition to the α-Fe2O3 structure to take place.

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