Layer Structured Calcium Bismuth Titanate by Mechanical Activation

Abstract:

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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.

Info:

Edited by:

M. Gupta and Christina Y.H. Lim

Pages:

47-50

DOI:

10.4028/www.scientific.net/JMNM.23.47

Citation:

M.H. Sim et al., "Layer Structured Calcium Bismuth Titanate by Mechanical Activation", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 47-50, 2005

Online since:

January 2005

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Price:

$35.00

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