Pi Ceramic Gmbh

Michael Hofmann

Eberhard Hennig

Antje Kynast

Michael Töpfer

The invention relates to a lead-free piezoceramic material based on bismuth sodium titanate (BST) having the following parent composition: x(BiNa)TiO-yBaTiO-zSrTiOwhere x+y+z=1 and 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1, 0&#x2264;z&#x2264;0.07 or x(BiNa)TiO-yBaTiO-zCaTiOwhere x+y+z=1 and 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1, 0&#x3c;z&#x2264;0.05 or x(BiNa)TiO-y(BiK)TiO-zBaTiOwhere x+y+z=1 and 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1, 0&#x2264;z&#x3c;1, characterized by addition of a phosphorus-containing material in a quantity that gives a phosphorus concentration of from 100 to 2000 ppm in the piezoceramic material.

Lead-free piezoceramic material based on bismuth sodium titanate (BST)

The invention relates to a piezoceramic material with reduced lead content, based on potassium sodium niobate (PSN) and having a defined parent composition. According to the invention the manner of addition of a mixture of Pb, Nb and optionally Ag and optionally Mn gives a wide sintering range together with reproducible electrical and mechanical properties of the material.

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Neustade an der Orla, Germany

Michael Hofmann