The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2012
Filed:
Feb. 25, 2009
Martin Letz, Mainz, DE;
Mark J. Davis, Summit, PA (US);
Bernd Ruedinger, Woerrstadt, DE;
Bernd Hoppe, Ingelheim, DE;
Bianca Schreder, Sulibach, DE;
Maria-louisa Aigner, Frankfurt a. Main, DE;
Daniela Seiler, Alzey, DE;
Martin Letz, Mainz, DE;
Mark J. Davis, Summit, PA (US);
Bernd Ruedinger, Woerrstadt, DE;
Bernd Hoppe, Ingelheim, DE;
Bianca Schreder, Sulibach, DE;
Maria-Louisa Aigner, Frankfurt a. Main, DE;
Daniela Seiler, Alzey, DE;
Schott AG, Mainz, DE;
Abstract
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'·Vof the glass-ceramic is at least 20 (MV/cm), wherein e′ 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.