Method of preparing barium, titanium, zirconium oxide ferroelectric ceramic compositions
US5032559A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | May 21, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 compositi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.