Sciences & technologie. B, Sciences de l’ingénieur
Volume 0, Numéro 32, Pages 25-28
2010-12-31
Effects Of Sintering Temperature On The Structure, Microstructure And Properties Of 0.935(bi0.5 Na0.5) Tio3 - 0.065batio3 Piezoelectric Ceramics
Authors : Lidjici H . Hobar F . Rguiti M . Trelcat J-f . Courtois C . Leriche Leriche .
Abstract
The influence of sintering temperature of 0.935(Bi0.5 Na0.5 )TiO3 -0.065BaTiO3 lead-free ceramics was studied from 1150°C to 1200°C. The X-ray diffraction patterns showed that all of the BNT6.5BT ceramics exhibited a single perovskite structure with the coexistence of the rhombohedral and tetragonal phase. A fine and homogeneous grains were observed for samples sintered at 1150 and 1160°C and the increase of the sintering temperature up to 1180-1200°C induces significant grain growth with the appearance of coarse grains. The values of remnant polarization Pr obtained at room temperature are 27, 31, 27 and 29 μC/cm2 for specimens sintered at 1150, 1160, 1180 and 12000C respectively. At room temperature, the sample sintered at 1180°C exhibited good performances: dielectric constant was 833 at 1 KHz, thick coupling factor kt was 0.52 and the kt/kp ratio was 2.08. Therefore, the ceramics can be suitable for ultrasonic transducers in commercial applications.
Keywords
free ceramics, sintering temperature, piezoelectric properties.
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