Layer Structured Calcium Bismuth Titanate by Mechanical Activation

Abstract:

Nanocrystalline calcium bismuth titanate (CaBi4Ti4O15), which exhibits a layer structure, has been successfully synthesized by mechanical activation of constituent oxides of CaO, Bi2O3 and TiO2 in a nitrogen atmosphere at room temperature. The phase-forming calcination at elevated temperatures that is always required is skipped. CaBi4Ti4O15 derived from mechanical activation consists of nanocrystallites, which occur as aggregates of ~50 nm in sizes. It demonstrates an improved sinterability and was sintered to a density of 93.4% theoretical density at 1175oC for 2 hours. Ferroelectric properties of sintered CaBi4Ti4O15 derived from mechanical activation have been studied. A peak dielectric constant of 1049 at the Curie temperature of 774oC was measured at 1MHz for CaBi4Ti4O15 sintered at 1175oC.

• Periodical: Journal of Metastable and Nanocrystalline Materials (Volume 23)
• Pages: 47-50
• DOI: https://doi.org/10.4028/www.scientific.net/JMNM.23.47
• Online since: January 2005
• Authors: M.H. Sim, J.M. Xue, J. Wang
• Keywords: CaBi₄Ti₄O₁₅, Dielectric Property, Mechanical Activation (MA), Nanocrystallinity

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