Preparation of nanocrystalline ferroelectric CaBi2Ta 2O9 by the urea method

S. P. Gaikwad; Renu Pasricha; V. Ravi

doi:10.1016/j.ceramint.2004.08.011

Preparation of nanocrystalline ferroelectric CaBi₂Ta ₂O₉ by the urea method

S. P. Gaikwad, Renu Pasricha, V. Ravi

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Abstract

A precipitate was formed when a aqueous solution of CaCl₂, BiCl₃, TaF₅ and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 °C yielded the nanocrystallites of ternary oxide CaBi₂Ta₂O₉ (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P_r) and coercive field (E_C) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110.

Original language	English (US)
Pages (from-to)	773-775
Number of pages	3
Journal	Ceramics International
Volume	31
Issue number	6
DOIs	https://doi.org/10.1016/j.ceramint.2004.08.011
State	Published - 2005

Keywords

A. Powders: chemical preparation
B. Electron microscopy
C. Dielectric properties
C. Ferroelectric properties

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2004.08.011

Cite this

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title = "Preparation of nanocrystalline ferroelectric CaBi2Ta 2O9 by the urea method",

abstract = "A precipitate was formed when a aqueous solution of CaCl2, BiCl3, TaF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 °C yielded the nanocrystallites of ternary oxide CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (Pr) and coercive field (EC) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110.",

keywords = "A. Powders: chemical preparation, B. Electron microscopy, C. Dielectric properties, C. Ferroelectric properties",

author = "Gaikwad, {S. P.} and Renu Pasricha and V. Ravi",

note = "Funding Information: One of the authors (V. Ravi) acknowledges DST Goverment of India (Grant No. SP/S1/H-19/2000) for financial assistance. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2005",

doi = "10.1016/j.ceramint.2004.08.011",

language = "English (US)",

volume = "31",

pages = "773--775",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd",

number = "6",

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T1 - Preparation of nanocrystalline ferroelectric CaBi2Ta 2O9 by the urea method

AU - Gaikwad, S. P.

AU - Pasricha, Renu

AU - Ravi, V.

N1 - Funding Information: One of the authors (V. Ravi) acknowledges DST Goverment of India (Grant No. SP/S1/H-19/2000) for financial assistance. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2005

Y1 - 2005

N2 - A precipitate was formed when a aqueous solution of CaCl2, BiCl3, TaF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 °C yielded the nanocrystallites of ternary oxide CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (Pr) and coercive field (EC) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110.

AB - A precipitate was formed when a aqueous solution of CaCl2, BiCl3, TaF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 °C yielded the nanocrystallites of ternary oxide CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (Pr) and coercive field (EC) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110.

KW - A. Powders: chemical preparation

KW - B. Electron microscopy

KW - C. Dielectric properties

KW - C. Ferroelectric properties

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DO - 10.1016/j.ceramint.2004.08.011

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JF - Ceramics International

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