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:
Jul. 16, 1991
Filed:
May. 21, 1990
Robert T McSweeney, Wakefield, MA (US);
Karlene Zuk, Peabody, MA (US);
GTE Products Corporation, Danvers, MA (US);
Abstract
A procedure used to prepare Ba(Ti.sub.1-x),Zr.sub.x)O.sub.3 compositions wherein 0<x<0.25 having a more completely randomized distribution of Ti and Zr atoms on the TiO.sub.2 sublattice of barium titanate is described. In accordance with the present invention there is provided a method for preparing barium titanium zirconium oxide ferroelectic ceramic. The present method comprises mixing tetraalkyl titanate and alkyl zirconate in appropriate amounts to produce (Ti.sub.1-x Zr.sub.x)alkoxide wherein 0<x<0.25; reacting (Ti.sub.1-x Zr.sub.x) alkoxide wherein 0<x<0.25 to form (Ti.sub.1-x Zr.sub.x)O.sub.2 wherein 0<x<0.25 admixing (Ti.sub.1-x Zr.sub.x)O.sub.2 with BaCO.sub.3, said BaCO.sub.3 being added in a molar ratio greater than 1 relative to (Ti.sub.1-x Zr.sub.x)O.sub.2 ; heating the admixture for a period of time and at a temperature sufficient to produce Ba(Ti.sub.1-x Zr.sub.x)O.sub.3 wherein 0<x<0.25. The improved randomization of the Ti and Zr atom distributions results in a ferroelectric ceramic material having squarer electrical polarization hysteresis loops and higher remanent polarization values than can be obtained from conventionally prepared materials of similar composition.