Schott Ag

Maria-Louisa Aigner

Bernd Hoppe

Bianca Schreder

Martin Letz

Mark J Davis

Bernd Ruedinger

Daniela Seiler

The process of making the glass-ceramic includes ceramicizing a starting glass at a heating or cooling rate during the ceramicization of at least 10 K/min, so that the glass-ceramic contains at least 50% by volume of ferroelectric crystallites with a maximum diameter of from 20 to 100 nm and not more than 10% by volume of nonferroelectric crystallitesis. The glass ceramic produced by the process contains no pores or not more than 0.01% by volume of the pores and a value of e'&#xb7;Vof the glass-ceramic is at least 20 (MV/cm), wherein e&#x2032; is the dielectric constant at 1 kHz and Vis the breakdown voltage per unit thickness. The ferroelectric crystallites preferably have a perovskite structure and are composed of substantially pure or doped BaTiOand/or BaTiO.

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Frankfurt-am-Main, Germany

Maria-Louisa Aigner