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Li(Ta,Nb)O(3) Solid Solutions

IP.com Disclosure Number: IPCOM000078399D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Scott, BA: AUTHOR [+4]

Abstract

There is described herein a novel material which exhibits the properties of ferroelectricity and efficient visions cathodoluminescence. The material is the solid solution system LiTa(1-x)Nb(x)O(3) which is unique, in that both efficient cathodoluminescence (lambda peak approx. 4900 angstroms [blue]) and ferroelectricity (Curie temperatures in the range of 550 < T(c) < 1200 degrees C) exist simultaneously in the same structure. The cathodoluminescence occurs over a composition range of x = 0.005 - 0.95, with a peak efficiency being displayed in a solid solution with x approx. 0.07. Over this composition range, T(c) varies between , 550-1150 degrees C. Thereby, use can be made of the large switchable spontaneous polarization (approx. 50 micron C/cm/2/) and efficient blue cathodoluminescence at room temperature.

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Li(Ta,Nb)O(3) Solid Solutions

There is described herein a novel material which exhibits the properties of ferroelectricity and efficient visions cathodoluminescence. The material is the solid solution system LiTa(1-x)Nb(x)O(3) which is unique, in that both efficient cathodoluminescence (lambda peak approx. 4900 angstroms [blue]) and ferroelectricity (Curie temperatures in the range of 550 < T(c) < 1200 degrees C) exist simultaneously in the same structure. The cathodoluminescence occurs over a composition range of x = 0.005 - 0.95, with a peak efficiency being displayed in a solid solution with x approx. 0.07. Over this composition range, T(c) varies between , 550-1150 degrees C. Thereby, use can be made of the large switchable spontaneous polarization (approx. 50 micron C/cm/2/) and efficient blue cathodoluminescence at room temperature.

To provide the material, crystals of LiNb(x)Ta(1-x)O(3) were prepared with x = 0.003 - 0.30 by the Czochralski technique from melts having an x value in the range of 0.01 - 0.70. Electron microprobe measurements were employed to analyze crystal composition and to qualitatively assess cathodoluminescence properties. Generally, cathodoluminescence intensity increased with the increasing of the value of x up to 0.07.

To obtain a direct comparison of the cathodoluminescence efficiency of the novel material described herein with the commercially available phosphor P15 (ZnO:Zn), LiTa(0.93)Nb(0.07)O(3) crystals were pulverized into a p...