LEAD ZIRCONATE TITANATE WITH IRON/TUNGSTEN DOPING, METHOD OF PRODUCING A PIEZOCERAMIC MATERIAL WITH THE LEAD ZIRCONATE TITANATE, AND USE OF THE PIEZOCERAMIC MATERIAL

摘要

The invention relates to a piezoceramic composition having a nominal empirical formula of Pb1-aREbAEc[ZrxTiy(FefWw)z]O3. RE is a rare earth metal with a rare earth metal fraction b and AE is an alkaline earth metal with an alkaline earth metal fraction c. Iron is present with an iron fraction f.z, and tungsten with a tungsten fraction w.z. In addition, the following relationships apply: a 1; 0 ≤ b ≤ 0.15; 0 ≤ c ≤ 0.5; f 0; w 0; 0.1 ≤ f/w ≤ 5; x 0; y 0; z 0 and x + y + z = 1. In addition, a method of producing a piezoceramic material using the piezoceramic composition is specified, and features the following steps: a) provision of a green ceramic body with the piezoceramic composition, and b) heat treatment of the green body, a piezoceramic of the piezoceramic material being produced from the piezoceramic composition. The heat treatment encompasses calcining and/or sintering of the piezoceramic composition. The piezoceramic composition undergoes compaction at below 1000°C. Metals which melt at low temperature (such as silver or a silver-palladium alloy with a low palladium content, for example) can therefore be sintered together with the piezoceramic composition. The piezoceramic material is, for example, an ultrasound transducer or a piezoceramic bending transducer. In particular the piezoceramic material is a multi-layer piezoelectric actuator which is used to drive the fuel valve of the internal-combustion engine of a motor vehicle.