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Microstructure evolution and phase transition in La/Mn doped barium titanate ceramics

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Author(s): Vesna Paunović | Vojislav Mitić | Vladimir Pavlović | Miroslav Miljković | Ljiljana Živković

Journal: Processing and Application of Ceramics
ISSN 1820-6131

Volume: 4;
Issue: 4;
Start page: 253;
Date: 2010;
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Keywords: BaTiO3 | Sintering | Microstructures | Ferroelectric properties

ABSTRACT
La/Mn codoped BaTiO3 with different La2O3 content, ranging from 0.1 to 5.0 at% La, was investigated regarding their microstructural and dielectric characteristics. The content of 0.05 at% Mn was constant in all investigated samples. The samples were sintered at 1320°C and 1350°C for two hours. Microstructural studies were done using SEM and EDS analysis. The fine-grained microstructure was obtained even for low content of La. The appearance of secondary abnormal grains with serrated features along grain boundaries was observed in 1.0 at% La-BaTiO3 sintered at 1350°C. Nearly flat permittivity-temperature response was obtained in specimens with 2.0 and 5.0 at% La. Using the modified Curie-Weiss law a critical exponent γ and C’were calculated. The obtained values of γ pointed out the diffuse phase transformation in heavily doped BaTiO3 and great departure from the Curie-Weiss law for low doped ceramics.

Tango Jona
Tangokurs Rapperswil-Jona

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