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

US8110121B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Francois Bamiere · Mannheim, DE
• Katrin Benkert · Birkenfeld, DE
• Stefan Denneler · Birkenfeld, DE
• Morgane Radanielina · Strasbourg, FR
• Carsten Schuh · Baldham, DE

Key dates

• Filing date: Dec 19, 2006
• Grant date: Feb 7, 2012
• Expiry date: Dec 20, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49155
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A piezoceramic composition has a nominal empirical formula of Pb1−aREbAEc[ZrxTiy(FefWw)z]O3. 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·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. 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° 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.