LEAD-FREE PIEZOCERAMIC MATERIAL COMPRISING THE MIXED SYSTEM OF ALKALINE EARTH PEROVSKITE AND BISMUTH METAL OXIDE, AND METHOD FOR PRODUCING SAID MATERIAL

摘要

The invention relates to a piezoceramic material comprising a binary mixed system of an alkaline earth perovskite ABO3 and a bismuth oxide BiMO3, wherein A is at least one alkaline earth metal, B is at least one element of the fourth main group and/or the fourth subgroup of the periodic system, M is an element selected from the group including scandium, ytterbium and indium, a perovskite portion of the alkaline earth perovskite of the binary mixed system is selected at a percentage ranging from 33%, inclusive, to 66%, inclusive, and a bismuth oxide portion of the bismuth oxide is selected at a percentage ranging from 66%, inclusive, to 33%, inclusive. The invention also relates to a method for producing a piezoceramic starting material. Said method comprises the following steps: a) providing a piezoceramic starting composition of the piezoceramic material and b) heat-treating the piezoceramic material, the result being the piezoceramic material. The invention allows the wet-chemical and therefore simple production of thin films of the piezoceramic material. The material, even when in the form of a thin layer, has excellent piezoelectric properties. The novel material is especially used in MEMS (micro electro mechanical systems). It can also be used in the production of actuators, e.g. for fuel injection systems or in ultrasound transducers.