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Nonstoichiometric lanthanum titanate polycrystalline coating material and growth technology thereof

A non-stoichiometric ratio, lanthanum titanate technology, applied in polycrystalline material growth, single crystal growth, crystal growth, etc., can solve the problems of sputtering and reducing the surface finish of the film, and achieve dense film layers and consistent crystallization direction Good, the effect of reducing production costs

Inactive Publication Date: 2015-03-04
CHANGZHOU PROSRUN PHOTOELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The molecular formula of lanthanum titanate crystal is La 2 Ti 2 o 7 , the lanthanum titanate crystal evaporation film with this stoichiometric ratio will produce a large amount of outgassing during the evaporation process, which is easy to cause splashing, thereby seriously reducing the surface finish of the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) La 2 o 3 (99.999%), TiO 2 (99.9%) was placed in a muffle furnace and raised to 500°C, kept at a constant temperature for three hours to remove excess water in the raw material, cooled to room temperature, and then mixed with Ti (99.9%) by La 2 Ti 2 o 7-x The chemical composition ingredients are mixed, where x=0.5, the mixed powder is ground on a mortar or grinder to mix evenly, and pressed into blocks on an isostatic press as required;

[0022] (2) Put the briquetting material obtained in step (1) into a molybdenum crucible, transfer the molybdenum crucible to a vertical temperature gradient furnace, adjust to a suitable position, power on the whole system to heat up after sealing, start the mechanical pump, diffusion pump successively, and vacuumize to 10 -3 Pa, when the furnace temperature reaches 1400°C, fill in the inert protective gas Ar, and continue to heat up to the set temperature of 1800°C;

[0023] (3) After the furnace temperature reaches the set t...

Embodiment 2

[0025] (1) La 2 o 3 (99.999%), TiO 2 (99.9%) was placed in a muffle furnace and raised to 500°C, kept at a constant temperature for three hours to remove excess water in the raw material, cooled to room temperature, and then mixed with Ti (99.9%) by La 2 Ti 2 o 7-x The chemical composition ingredients are mixed, where x=0.9, the mixed powder is ground on a mortar or grinder to mix evenly, and pressed into blocks on an isostatic press as required;

[0026] (2) Put the briquetting material obtained in step (1) into a molybdenum crucible, transfer the molybdenum crucible to a vertical temperature gradient furnace, adjust to a suitable position, power on the whole system to heat up after sealing, start the mechanical pump, diffusion pump successively, and vacuumize to 10 -4 Pa, when the furnace temperature reaches 1700°C, fill in the inert protective gas Ar, and continue to heat up to the set temperature of 1900°C;

[0027] (3) After the furnace temperature reaches the set t...

Embodiment 3

[0029] (1) La 2 o 3 (99.999%), TiO 2 (99.9%) was placed in a muffle furnace and raised to 500°C, kept at a constant temperature for three hours to remove excess water in the raw material, cooled to room temperature, and then mixed with Ti (99.9%) by La 2 Ti 2 o 7-x The chemical composition ingredients are mixed, where x=0.7, the mixed powder is ground on a mortar or grinder to mix evenly, and pressed into blocks on an isostatic press as required;

[0030] (2) Put the briquetting material obtained in step (1) into a molybdenum crucible, transfer the molybdenum crucible to a vertical temperature gradient furnace, adjust to a suitable position, power on the whole system to heat up after sealing, start the mechanical pump, diffusion pump successively, and vacuumize to 10 -4 Pa, when the furnace temperature reaches 1600°C, fill in the inert protective gas Ar, and continue to heat up to the set temperature of 1850°C;

[0031] (3) After the furnace temperature reaches the set t...

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Abstract

The invention relates to a nonstoichiometric lanthanum titanate polycrystalline coating material and a growth technology thereof. The nonstoichiometric lanthanum titanate polycrystalline coating material has the chemical composition of La2Ti2O7-x, wherein x is equal to 0.5-0.9; and the lanthanum titanate polycrystalline coating material grows by adopting a vertical temperature gradient method. The efficiency of the La2Ti2O7-x crystal produced by adopting the vertical temperature gradient method is greatly improved, the vertical temperature gradient method contributes to saving the energy consumption, reducing the production cost and realizing large-scale industrial production of crystals, the La2Ti2O7-x crystal prepared by adopting the vertical temperature gradient method is uniform in composition, high in crystallinity, large in grain size, high in crystallization direction consistency and is easily crushed into small particles specially used for coating, the coating operability is high, and the obtained film is dense, uniform and stable.

Description

technical field [0001] The invention relates to the technical field of crystal growth, in particular to a growth technology for growing a non-stoichiometric ratio lanthanum titanate polycrystalline coating material by using a vertical temperature gradient method. Background technique [0002] Lanthanum titanate crystal (LTO for short) has good ferroelectric, photocatalytic and electro-optical properties, and has a very broad application prospect in the field of light and electricity. It has been applied in high-temperature electro-optic equipment and information storage, new high-performance microwave dielectric materials, high-temperature sensors and microwave piezoelectric bodies, etc. [0003] Here we focus on the application of lanthanum titanate crystals as coating materials with excellent performance in optoelectronic devices, such as display technology, imaging technology, light output and light integration devices, etc. LTO coating material has stable high refractiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B28/06
CPCC30B29/32C30B28/06
Inventor 李新华李超丁书强
Owner CHANGZHOU PROSRUN PHOTOELECTRIC TECH CO LTD
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