Coprecipitation method for the preparation of nanocrystalline ferroelectric CaBi 2Ta 2O 9

A simple coprecipitation technique had been successfully applied for the preparation of pure ultrafine single-phase CaBi 2Ta 2O 9 (CBT). Ammonium hydroxide and ammonium oxalate were used to precipitate Ca 2+, Bi 3+ and Ta 5+ cations simultaneously. No pyrochlore phase was found while heating powder...

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Bibliographic Details
Published inMaterials letters Vol. 58; no. 27; pp. 3474 - 3476
Main Authors Gaikwad, S.P., Dhesphande, S.B., Khollam, Y.B., Samuel, Violet, Ravi, V.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2004
Subjects
Ceramics
Chemical synthesis
Electronic material
Ferroelectricity
Oxides
Ferroelectricity
Electronic material
Oxides
Ceramics
Chemical synthesis
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Summary:A simple coprecipitation technique had been successfully applied for the preparation of pure ultrafine single-phase CaBi 2Ta 2O 9 (CBT). Ammonium hydroxide and ammonium oxalate were used to precipitate Ca 2+, Bi 3+ and Ta 5+ cations simultaneously. No pyrochlore phase was found while heating powder at 800 °C and pure CaBi 2Ta 2O 9 phase was found to be formed by XRD. Particle size and morphology was studied by transmission electron microscopy (TEM). The room temperature dielectric constant at 1 kHz is 100. The ferroelectric hysteresis loop parameters of these samples were also studied.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2004.07.004