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 language | English |
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Pages (from-to) | 413-418 |
Number of pages | 6 |
Journal | Solid State Ionics |
Volume | 151 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 2002 Nov |
Externally published | Yes |
Event | SSP- 2000 - Tokyo, Japan Duration: 2000 Dec 11 → 2000 Dec 13 |
Keywords
- Butanedioc acid
- Hydroxy
- LiNbO
- Malic acid
- Niobate
- Powder synthesis
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics