Chemical synthesis of lithium niobate powders (LiNbO3) prepared from water-soluble DL-malic acid complexes

E. R. Camargo, M. Kakihana

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Lithium niobate powders were prepared from LiCl and a new water-soluble complex synthesized with DL-malic acid (MA) and NbCl5, using neither dry solvents nor an inert atmosphere. A stable aqueous solution was prepared containing niobium chloride and MA, with a molar ratio of [MA]:[Nb] = 2:1 at pH = 7. UV-Raman spectroscopy of the Nb-MA aqueous solution indicated the coordination of the Nb with the deprotonated alcohol and with the carboxylic groups of the MA molecule. Continuous heating of a mixed aqueous solution containing MA, ammonia, Li, and Nb ions at 70°C produced a pale yellow powder which was heat treated at 350°C for 5 h to sublimate NH4Cl, eliminating more than 99.5 wt % of the chlorine. The Nb-Li-MA heated-treated powder was calcined under different conditions of temperature and time. The formation of pure LiNbO3, free from amorphous carbon, which occurred at temperatures greater than 650°C, was confirmed by a combined analysis using X-ray diffraction and UV-Raman spectroscopy.

Original languageEnglish
Pages (from-to)1905-1909
Number of pages5
JournalChemistry of Materials
Volume13
Issue number5
DOIs
Publication statusPublished - 2001 Sep 26
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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