UNLEADED PIEZOCERAMIC MATERIAL OF THE POTASSIUM/SODIUM/NIOBATE SYSTEM HAVING A IRON/LANTHANUM DOPING, METHOD FOR THE PRODUCTION OF A COMPONENT COMPRISING THE PIEZOCERAMIC MATERIAL AND USE OF THE COMPONENT

摘要

The invention relates to a piezoceramic material, having a Perowskit phase comprising the stoichiometric composition (K1-xLax) (Nb1-yFey) O3 where 0.002 ≤ x ≤ 0.1 and 0.002 ≤ y ≤ 0.1. Said material preferably comprises a further alkali metal is contained in addition to potassium sodium at a proportion of 0.4 mol-% to 0.6 mol-%. This composition creates a system having a morphotropic phase threshold. Said system is accompanied by excellent piezoelectric properties. The invention further relates to a method for the production of a piezoceramic component using the piezoceramic material having the following process steps: a) providing a green body, wherein the piezoceramic material of the component is created from the piezoceramic basic material, b) heat treatment of the green body, wherein the piezoceramic basic material of the component results from the piezoceramic basic material. The thermal treatment comprises a calcinating and/or sintering of the piezoceramic composition. The piezoceramic component is, for example, an ultrasonic transducer, or a piezoceramic bending transducer. Particularly, the piezoceramic component is a multi-layer piezoactuator, which is used for activating a fuel valve of an internal combustion engine of a motor vehicle.