Preparation of LiTaO3 powders at reduced temperatures by a polymerized complex method

Judit Szanics, Toru Okubo, Masato Kakihana

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A polymerized complex technique was utilized to prepare LiTaO3 at reduced temperatures, viz. 500-600°C. A methanol-citric acid (CA) solution of TaCl5 was found to be highly resistant to ambient moisture in air. Heating of a mixed-solution of methanol, CA, ethylene glycol (EG), Li and Ta ions with a molar ratio of [Methanol]:[CA]:[EG]:[Li]:[Ta]=1:0.1:0.4:0.01:0.01 at 130°C produced a yellow transparent polymeric gel without any precipitation, which after pyrolysis at 300°C was converted to a powder precursor for LiTaO3. The formation of pure LiTaO3 occurred during the heat treatment of the powder precursor at temperatures higher than 500°C in static air, which was confirmed by a combined analysis using XRD and Raman scattering techniques. No X-ray diffraction and Raman spectroscopic evidence for phase separation of crystalline Li2CO3 and Ta2O5 as distinct intermediates has been obtained during the thermal decomposition of the powder precursor.

Original languageEnglish
Pages (from-to)206-210
Number of pages5
JournalJournal of Alloys and Compounds
Volume281
Issue number2
DOIs
Publication statusPublished - 1998 Dec 18
Externally publishedYes

Keywords

  • LiTaO
  • Polymerized complex method
  • Tantalum precursor

ASJC Scopus subject areas

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

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