Low temperature synthesis of lithium niobate powders based on water-soluble niobium malato complexes

Emerson R. Camargo, Masato Kakihana

Research output: Contribution to journalConference articlepeer-review

56 Citations (Scopus)

Abstract

Pure lithium niobate (LN) powders were prepared by a wet-chemical method. Hydrated niobium oxide was dissolved in a hot aqueous solution of oxalic acid, followed by the precipitation of niobic acid by the addition of ammonia solution until pH = 11. Niobic acid precipitated was dissolved in an aqueous solution of dl-malic acid. A small amount of the Nb-malic complex synthesized was isolated and characterized by thermogravimetry (TG) and infrared (IR) spectroscopy, and the molecular composition of the complex was determined as H[Nb2O(H3C4O5)3]. The exact content of niobium in the stable solution of Nb-malic solution was determined by gravimetric analysis. Stoichiometric amount of lithium carbonate was added into Nb-malic solution. After the solvent elimination, the remaining solid powder was calcined at 350 °C, ground and calcined over a temperature range from 300 to 900 °C. Calcined powders were characterized by X-ray diffraction (XRD) and Raman spectroscopy. Crystalline LN phase was identified at 500 °C/2 h, although the total elimination of the inorganic carbon occurred only at 650 °C/2 h.

Original languageEnglish
Pages (from-to)413-418
Number of pages6
JournalSolid State Ionics
Volume151
Issue number1-4
DOIs
Publication statusPublished - 2002 Nov
Externally publishedYes
EventSSP- 2000 - Tokyo, Japan
Duration: 2000 Dec 112000 Dec 13

Keywords

  • Butanedioc acid
  • Hydroxy
  • LiNbO
  • Malic acid
  • Niobate
  • Powder synthesis

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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