A novel tantalic acid-based polymerizable complex route to LiTaO3 using neither alkoxides nor chlorides of tantalum

Judit Szanics, Masato Kakihana

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22 Citations (Scopus)

Abstract

A novel tantalic acid-based polymerizable complex (PC) route to LiTaO3 was developed that uses neither alkoxides nor chlorides of Ta. Moisture-insensitive Ta2O5 was chosen as a starting source of Ta, and it was converted to a Ta-oxalate solution by means of the classic KHSO4-oxalic acid method of Schoeller. Tantalic acid precipitated upon addition of ammonia solution to the Ta-oxalate solution. The freshly precipitated tantalic acid was soluble in a hot oxalic acid aqueous solution, and it was quite stable against hydrolysis. This water-resistant Ta precursor mixed with citric acid (CA), ethylene glycol (EG), and Li2CO3 was polymerized at 130°C to produce a yellowish transparent polyester-type resin without undergoing precipitation, which after decomposition on heating at 350°C was used as a powder precursor for LiTaO3. Phase-pure LiTaO3 in powder form was successfully synthesized at a reduced temperature (500°C). The final LiTaO3 powder calcined at 500-700°C had a considerably large surface area in the range of 22-37 m2/g when compared with 1.4 m2/g for the conventional solid-state reaction powder of the same compound.

Original languageEnglish
Pages (from-to)2760-2763
Number of pages4
JournalChemistry of Materials
Volume11
Issue number10
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

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

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