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:
Nov. 09, 2004
Filed:
Feb. 24, 2003
Applicant:
Inventors:
Harald Bachhofer, München, DE;
Thomas Haneder, Dachau, DE;
Oswald Spindler, Vaterstetten, DE;
Rainer Waser, Aachen, DE;
Assignee:
Infineon Technologies AG, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/100 ;
U.S. Cl.
CPC ...
H01L 2/100 ;
Abstract
In a method for producing ferroelectric strontium bismuth tantalate having the composition Sr Bi Ta O (SBT) or Sr Bi (Ta, Nb) O (SBTN), the element strontium, which is normally present in an amount y=2, is provided in excess in a range from 2.1≦y≦3.0. This makes it possible to carry out the heat treatment step for converting the deposited material into the ferroelectric phase at a temperature T , which is lower than 700° C. In addition, the strontium content x can be reduced from a nominal value of 1 to 0.7.