BNT-based multilayer device with large and temperature independent strain made by a water-based preparation process

作者：Krauss Werner; Schuetz Denis; Naderer Michael; Orosel Denis; Reichmann Klaus^*

来源：Journal of the European Ceramic Society, 2011, 31(9): 1857-1860.

DOI：10.1016/j.jeurceramsoc.2011.02.032

• BNT
• Lead-free
• Multilayer
• Piezoelectricity
• Actuators

A piezoelectric multilayer device based on bismuth sodium titanate ceramics (BNT) co-fired with Ag/Pd inner electrodes is described and its dielectric and piezoelectric properties are measured. The ceramic powder and tape was made by a water-based preparation process. After printing with Ag/Pd paste for inner electrodes these tapes were stacked to a multilayer device with 50 active layers. This device exhibited a large and temperature independent strain around 0.19% between 25 degrees C and 150 degrees C. The large strain is due to a field-induced phase transition. The low temperature dependence results from the broadening of the nonpolar phase by doping.

• 出版日期2011-8