Strontium bismuth tantalate layered ferroelectric ceramics: Reaction kinetics and thermal stability
Resource
Ceramics International 24 (4): 285-291
Journal
Ceramics International
Journal Volume
24
Journal Issue
4
Pages
285-291
Date Issued
1998
Date
1998
Author(s)
Lee, Jiun-Ting
Abstract
Using BiTaO4 as the precursor, ferroelectric strontium bismuth tantalate SrBi2Ta2O9 was successfully synthesized. Heating the mixtures of BiTaO4 and SrCO3 at 800°C resulted in the entire formation of a single phase SrBi2- Ta2O9. The formation process of this compound was verified to be a direct reaction occurring between the reactants without the presence of intermediates. The conversion of SrBi2Ta2O9 was isothermally analyzed for exploring the reaction kinetics. The results revealed that the formation process was controlled by the diffusion process. Based on the Ginstling-Brounshtein and Jander models, the activation energy of the diffusion process was estimated to be 194.3 kJ mol-1 and 210.7 kJ mol-1, respectively. SrBi2Ta2O9 was found to become unstable when heated at above 1200°C. Once the decomposition process started, this compound was dissociated into SrTa2O6 and Bi2O3 from surface to interior. © 1998 Elsevier Science Limited and Techna S.r.1. All rights reserved.
Type
journal article
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