Single crystal ingot using barium zirconium oxide and preparation method therefor

Patent metadata

Field	Value
Publication number	US-11248309-B2
Application number	US-201916979369-A
Country	US
Kind code	B2
Filing date	May 30, 2019
Priority date	Jun 22, 2018
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

Disclosed is a method of preparing single crystal ingot of barium zirconium oxide. The method includes preparing a cylindrical BaZrO3 ceramic by pulverizing a BaZrO3 compound into a powder and sintering the same into a cylindrical ceramic form, ii) fixing two cylindrical BaZrO3 ceramics to an optical floating zone furnace, joining the two cylindrical BaZrO3 ceramics together and melting the junction at a temperature of 2,600 to 3,500° C. using light emitted from a xenon lamp or laser, and after the melting, moving the two cylindrical BaZrO3 ceramics in a direction parallel to an axis of rotation thereof, enabling the molten junction to be solidified, and thereby growing a single crystal.

First claim

The invention claimed is:

1. A method of preparing single crystal ingot of barium zirconium oxide, comprising:
i) preparing a cylindrical BaZrO 3 ceramic by pulverizing a BaZrO 3 compound into a powder and sintering the same into a cylindrical ceramic form;
ii) fixing two cylindrical BaZrO 3 ceramics in an optical floating zone furnace;
iii) joining the two cylindrical BaZrO 3 ceramics together and melting the junction at a temperature of 2,600 to 3,500° C. using light emitted from a xenon lamp or laser; and
iv) after the melting, moving the two cylindrical BaZrO 3 ceramics in a direction parallel to an axis of rotation thereof, enabling the molten junction to be solidified, and thereby growing a single crystal.

2. The method of claim 1 , wherein the BaZrO 3 compound is prepared by firing and sintering at a temperature of 1,000 to 1,750° C. using a solid state reaction method.

3. The method of claim 1 , wherein, in the step iii), one of the two cylindrical BaZrO 3 ceramics is rotated clockwise while the other is rotated counterclockwise such that they rotate at a speed of 0 to 50 rpm.

4. The method of claim 3 , wherein, in the step iii), simultaneously with the rotation, the two cylindrical BaZrO 3 ceramics are moved at a speed of 5 to 60 mm/hr in a direction parallel to the axis of rotation so that the ceramics come into contact with each other.

Assignees

• Ulsan Nat Inst Science & Tech Unist

Inventors

• Oh Yoon Seok

Classifications

• H10D62/80

  characterised by the materials · CPC title

• C30B13/24 Primary

  using electromagnetic waves · CPC title

• C30B13/32

  Mechanisms for moving either the charge or the heater · CPC title

• C30B29/22 Primary

  Complex oxides · CPC title

• C30B15/30

  Mechanisms for rotating or moving either the melt or the crystal (flotation methods C30B15/28) · CPC title