Synthesis and characterization of cerium substituted hematite by sol-gel method

Nimai Chand Pramanik, Tarequl Islam Bhuiyan, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Sang Il Seok

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Fine particles of cerium substituted hematite with different compositions were prepared by the sol-gel method from the aqueous solution of their corresponding metal salts. Mixed hydroxides of Fe3+ and Ce 4+ were obtained by reacting aqueous NH3 with the aqueous solution of FeCl3 and Ce(NH3)2(NO 3)6 at pH 2.5-3.0) and they were heat treated at different temperatures between 400 and 1200°C in air for 2 h to get the mixed oxide product. Thermal analysis and X-ray diffraction studies revealed the coexistence of Fe2O3 and CeO2 phase separately up to 900°C, and covalent interaction between them above 1000°C, which was evidenced by the shifting of the XRD peaks. Unit cell parameters and the cell volumes (V) of the samples derived between 1000 and 1200°C were found to be in the range a = 5.045-5.048 ± 0.007 Å, c = 13.774-13.815 ± 0.041 Å and V = 303.608-304.874 Å3 respectively. It was observed that both the lattice parameters and the cell volumes were higher than that of the pure α-Fe2O3 (a = 5.036 Å, c = 13.749 Å, V = 301.976 Å3) system. The expansion of lattice parameters further supported the incorporation of the large Ce 4+ ion into the α-Fe2O3 matrix. The lattice parameter increased with increasing Ce4+ ion loading. FESEM studies showed the growth of the particles with increasing temperature though it was suppressed due to the presence of Ce4+ ions as compared to the pure system.

Original languageEnglish
Pages (from-to)3783-3787
Number of pages5
JournalMaterials Letters
Volume59
Issue number28
DOIs
Publication statusPublished - Dec 1 2005

Keywords

  • Cerium substituted FeO
  • Crystal growth
  • Sol-gel method
  • XRD

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Synthesis and characterization of cerium substituted hematite by sol-gel method'. Together they form a unique fingerprint.

  • Cite this

    Pramanik, N. C., Bhuiyan, T. I., Nakanishi, M., Fujii, T., Takada, J., & Seok, S. I. (2005). Synthesis and characterization of cerium substituted hematite by sol-gel method. Materials Letters, 59(28), 3783-3787. https://doi.org/10.1016/j.matlet.2005.06.056