Journal of the American Ceramic Society · 2015 · 27 citations · 22 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMaterials CharacterizationCeramic ProcessingCeramic TechnologyElectrical Properties Of CeramicsFerroelectric CeramicsSinteringStructural CeramicsCeramic Actuator MaterialsMultilayer ActuatorsMultilayer Piezoelectric ActuatorsPiezoelectric EffectPiezoelectric TransducersSintering BehaviorSound DevicesTechnical Ceramics
We investigated the influence of CuO amount (0.5–3.0 mol%), sintering temperature (900°C–1000°C), and sintering time (2–6 h) on the low‐temperature sintering behavior of CuO‐added Bi 0.5 (Na 0.78 K 0.22 ) 0.5 TiO 3 ( BNKT 22) ceramics. Normalized strain ( S max / E max ), piezoelectric coefficient ( d 33 ), and remanent polarization ( P r ) of 1.0 mol% CuO‐added BNKT 22 ceramics sintered at 950°C for 4 h was 280 pm/V, 180 pC/N, and 28 μC/cm 2 , respectively. These values are similar to those of pure BNKT 22 ceramics sintered at 1150°C. In addition, we investigated the performance of multilayer ceramic actuators made from CuO‐added BNKT 22 in acoustic sound speaker devices. A prototype sound speaker device showed similar output sound pressure levels as a Pb(Zr,Ti)O 3 ‐based device in the frequency range 0.66–20 kHz. This result highlights the feasibility of using low‐cost multilayer ceramic devices made of lead‐free BNKT ‐based piezoelectric materials in sound speaker devices.
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