Effects of 0.03MF₂ – 0.12LiF (M = Ca, Sr, Ba) on the Sintering and Dielectric Properties of SrTiO₃ Ceramics

Abstract:

Cold-pressed pellets were prepared from the mixtures SrTiO₃ - 0.03MF₂ - 0.12LiF, M = Ca, Sr or Ba, then air-fired at 950 °C for 2 hours. The obtained samples were investigated by X-ray diffraction and scanning electron microscopy. Each ceramic is a perovskite single phase and the relative density reaches 95% for all ceramics. The addition of 3 mol. % of the eutectic composition 1MF₂ - 4LiF (T_m ~ 760 °C) to SrTiO₃ lowers the sintering temperature of pure strontium titanate from 1400 °C to 950 °C and induces a strong modification in the SrTiO₃ cubic phase: superlattice reflections are detected and the unit cell symmetry becomes orthorhombic. Dielectric measurements were performed between - 150 °C and 200 °C in the frequency range 20 Hz - 10⁹ Hz. The dielectric permittivity ε_r showed no maximum in the temperature range investigated and is almost frequency independent. At room temperature, the dielectric losses tanδ are less than 0.1 %. Moreover, the frequency dependence of the complex permittivity exhibits a resonance in the microwave region. These fluorinated ceramics could be of interest in piezoelectric devices and are promising dielectrics for class I capacitors manufactured at low temperature.

• Periodical: International Journal of Engineering Research in Africa (Volume 9)
• Pages: 1-12
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.9.1
• Online since: May 2013
• Authors: Laldja Taïbi-Benziada, Hassiba Kermoun, Yasmina Belaroussi
• Keywords: Ceramic, Dielectric Property, Microstructure, Sintering, SrTiO₃

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