| 摘要 |
The invention relates to a piezoceramic material comprising at least one perovskite phase having the empirical formula (LixK1-x-yNay)(Nb1-wTaw)O3 and having a mole fraction of perovskite ap and at least one tungsten bronze phase having the empirical formula (Ba1-u-vSruCav(Nb2O6) and a mole fraction of tungsten bronze aw, where the following relationship applies: ap + aw = 1. The material is characterized in that the following further relationship applies: 0.026 < aw = 0.05. In addition, a process for producing a piezoceramic component comprising the piezoceramic material, which comprises the following process steps: a) provision of a green body comprising a piezoceramic starting composition of the piezoceramic material and b) heat treatment of the green body to form the piezoceramic material of the component from the piezoceramic starting composition, is provided. The heat treatment encompasses calcination and/or sintering of the piezoceramic composition. The resulting piezoceramic material displays good piezoelectric properties, for example a d33 coefficient of virtually 300 pm/V and a Curie temperature of over 250°C. The piezoceramic component is, for example, an ultrasonic transducer or a piezoceramic bending transducer. In particular, the piezoceramic component is a multilayer piezoactuator which is used for controlling a fuel valve of an internal combustion engine of a motor vehicle. |
