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Effects of doping on the thermal stability of spindle-shaped γ-Fe2O3 particles

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Abstract

Spindle-shaped α-FeOOH particles were synthesized using the chemical coprecipitation method in Fe(CO3)x(OH)2(−x) suspensions system by adding metallic ions. The spindle-shaped γ-Fe2O3 particles were obtained by dehydration of α-FeOOH, and subsequent reduction and oxidation. Its thermal stability was investigated by differential thermal analysis (DTA). It was found that the transition temperature of γ-Fe2O3→α-Fe2O3 of samples doped with metallic ions is higher than that of the pure γ-Fe2O3 and increasing with increase of the size of the metallic ions, and γ-Fe2O3 by doping with two or more different metallic ions together has even higher thermal stability. The origin of the improved thermal stability was discussed. Additionally, the magnetic properties of γ-Fe2O3 were measured.

Zusammenfassung

Mittels chemischer Kopräzipitation in Fe(CO3)x(OH)2(−x) Suspensionssysteme durch Zusatz von Metallionen wurden spindelförming α-FeOOH-Partikel hergestellt. Spindelförmige γ-Fe2O3-Partikel wurden durch die Dehydratation von α-FeOOH und anschließende Reduktion und Oxidation erhalten. Deren thermische Stabilität wurde mittels DTA untersucht. Man fand, daß die Umwandlungstemperatur von γ-Fe2O3→α-Fe2O3 für Proben, die mit Metallionen versetzt wurden, höher ist als die von reinem γ-Fe2O3 und mit anwachsender Größe des Metallions zunimmt und daß γ-Fe2O3 durch gleichzeitiges Versetzen mit zwei oder noch mehr unterschiedlichen Metallionen eine höhere thermische Stabilität aufweist. Der Ursprung dieser verbesserten thermischen Stabilität wird diskutiert. Zusätzlich wurden die magnetischen Eigenschaften von γ-Fe2O3 gemessen.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, Auhui, P. R. China

    Hongmei Luo & Huanxing Zeng

Authors
  1. Hongmei Luo
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  2. Huanxing Zeng
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Luo, H., Zeng, H. Effects of doping on the thermal stability of spindle-shaped γ-Fe2O3 particles. Journal of Thermal Analysis 45, 185–191 (1995). https://doi.org/10.1007/BF02548678

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  • DOI: https://doi.org/10.1007/BF02548678

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