Siemens Aktiengesellschaft

Francois Bamiere

Carsten Schuh

Katrin Benkert

Stefan Denneler

Morgane Radanielina

A piezoceramic composition has a nominal empirical formula of PbREAE[ZrTi(FeW)]O. RE is a rare earth metal with a fraction b and AE is an alkaline earth metal with a fraction c. Iron is present with an iron fraction f&#xb7;z, and tungsten with a tungsten fraction w&#xb7;z. In addition, the following relationships apply: a&#x3c;1; 0=b=0.15; 0=c=0.5; f&#x3e;0; w&#x3e;0; 0.1=f/w=5; x&#x3e;0; y&#x3e;0; z&#x3e;0 and x+y+z=1. A method of producing a piezoceramic material using the piezoceramic composition has the 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. The piezoceramic composition undergoes compaction at below 1000&#xb0; 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.

Lead zirconate titanate with iron/tungstein doping, method of producing a piezoceramic material with the lead zirconate titanate, and use of the piezoceramic material

A piezoceramic composition of a calculated empirical formula PbREAE[ZrTi(NiMo)]O, wherein RE represents a rare earth metal having a rare earth metal content b, AE represents an alkaline earth metal having an alkaline earth metal content c, nickel is provided with a nickel content n.z, and molybdenum is provided with a molybdenum content m.z. Furthermore, the following correlations apply: a&#x3c;1; 0=b=0.15; 0=c=0.5; n&#x3e;0; m&#x3e;0; 0.1=n/m=5; x&#x3e;0; y&#x3e;0; z&#x3e;0, and x+y+z=1. In a method for producing a piezoceramic component a) a green ceramic member containing the piezoceramic composition is supplied; and b) the green member is subjected to a thermal treatment such that the piezoceramic material of the component is produced from the piezoceramic composition. The thermal treatment encompasses calcining and/or sintering of the piezoceramic composition. The piezoceramic composition is compressed below 1000&#xb0; C., thus allowing metals melting at a lower temperature to be sintered along with the piezoceramic composition.

Nickel-molybdenum-doped lead zirconate titanate, method for the production of a piezoceramic component using said lead zirconate titanate, and use of the piezoceramic component

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Mannheim, Germany

Francois Bamiere