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Hydrothermal synthesis of nanosized BaTiO3 powders and dielectric properties of corresponding ceramics

Boulos, Madona and Guillemet-Fritsch, Sophie and Mathieu, François and Durand, Bernard and Lebey, Thierry and Bley, Vincent Hydrothermal synthesis of nanosized BaTiO3 powders and dielectric properties of corresponding ceramics. (2005) Solid State Ionics, vol. 1 (n° 13-). pp. 1301-1309. ISSN 1293-2558

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Official URL: http://dx.doi.org/10.1016/j.ssi.2005.02.024

Abstract

BaTiO3 fine powders were synthesized by hydrothermal method at 150 °C or 250 °C for 7 h, starting from a mixture of TiCl3 + BaCl2 or TiO2 + BaCl2. The size of the crystallites is close to 20 nm whatever the starting mixture and the reaction temperature. These powders are well crystallized and constituted of a mixture of the metastable cubic and stable tetragonal phases. The ceramics obtained after uniaxial pressing and sintering at 1250 °C for 10 h or 20 h present high densification (up to 99.8%). The Curie temperature (Tc) and the electrical permittivity ( r) of the ceramics strongly depend on the type of titanium source that has been used for preparing the powder and on the sintering dwell time. Particularly, Tc is shifted towards lower temperature when TiCl3 is used. The permittivity value at Tc of BaTiO3 sintered at 1250 °C for 10 h reaches 7000 and 11,000 with respectively TiCl3 and TiO2 used as titanium source.

Item Type:Article
Additional Information:http://www.sciencedirect.com/science/journal/01672738
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Thomas Bonnecarere
Deposited On:05 May 2008 13:23

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