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Ferroelectric Compounds

IP.com Disclosure Number: IPCOM000093510D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Burns, G: AUTHOR [+3]

Abstract

These are ferroelectric compounds having the general formula xANbO(3). (1-x)M Nb(2)O(6), where A is an element selected from group 1 of the periodic table and M is a divalent element such as CaSr and Ba. The prepared compositions, exemplified by the xKNbO(3).(1-x)SrNb(2)O(6) system, where x has a value of from 0.25 to 0.7, are solid solutions. The compositions are prepared by heating a mixture of a previously prepared alkali niobate, e.g., KNbO(3), and alkaline earth niobates, e.g., SrNb(2)O(6), at a temperature of from 1100 degrees C to 1300 degrees C. The heated mixture is cooled, powdered and reheated repetitively to promote complete reaction of the starting materials. Finally, the powder product is pressed into disks which are subsequently fired. Tantalate duct is pressed into disks which are subsequently fired.

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Ferroelectric Compounds

These are ferroelectric compounds having the general formula xANbO(3). (1-x)M Nb(2)O(6), where A is an element selected from group 1 of the periodic table and M is a divalent element such as CaSr and Ba. The prepared compositions, exemplified by the xKNbO(3).(1-x)SrNb(2)O(6) system, where x has a value of from 0.25 to 0.7, are solid solutions. The compositions are prepared by heating a mixture of a previously prepared alkali niobate, e.g., KNbO(3), and alkaline earth niobates, e.g., SrNb(2)O(6), at a temperature of from 1100 degrees C to 1300 degrees C. The heated mixture is cooled, powdered and reheated repetitively to promote complete reaction of the starting materials. Finally, the powder product is pressed into disks which are subsequently fired. Tantalate duct is pressed into disks which are subsequently fired. Tantalate analogs of the above compounds are also prepared. Single crystals of xKNbO(3).(1-x)SrNb(2)O(6), where x = 0.6 and 0.33, are prepared from their melts. The materials so prepared are used in electro-optic applications.

The following table indicates the properties of some polycrystalline compounds prepared by the above method.

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