Low temperature powder synthesis of LaAlO3 through in situ polymerization route utilizing citric acid and ethylene glycol

Masato Kakihana, Toru Okubo

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama 226, Japan Powders of LaAlO3 with large surface areas were synthesized by the polymerized complex technique based upon in situ polyesterification between citric acid (CA) and ethylene glycol (EG). Heating of a mixed solution of CA, EG, and nitrates of lanthanum and aluminium at 130°C gave brown transparent gel without any precipitation. The gel was preheated at 350°C to give a black powdery mass, which was subsequently used as a precursor for LaAlO3. The formation of pure perovskite LaAlO3 occurred when the precursor was heat-treated in a furnace set at 700°C for 8 h or at 750°C for 2 h. No X-ray diffraction evidence for the presence of crystalline impurities was obtained. The LalO3 powder prepared by the polymerized complex method had a considerably large surface area in the range of 13-16 m2 g-1 when compared with ∼0.3 m2 g-1 for the conventional solid-state reaction powder of the same compound.

Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalJournal of Alloys and Compounds
Volume266
Issue number1-2
DOIs
Publication statusPublished - 1998 Feb 20
Externally publishedYes

Keywords

  • Citric acid
  • Ethylene glycol
  • In situ polymerization
  • Laalo
  • Polymerized complex method
  • polymer gel

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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