Apparatus for producing a single crystal of a metal oxide comprising a Pt-Rh alloy heater coated with zirconia

Patent metadata

Field	Value
Publication number	US-10280530-B2
Application number	US-201815866952-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Mar 2, 2017
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

To provide a single crystal production apparatus that is capable of prolonging the lifetime of a heater, and capable of reducing the cost. A single crystal production apparatus of the present invention is the single crystal production apparatus which produces a single crystal of a metal oxide in an oxidative atmosphere, containing: a base body; a cylindrical furnace body having heat resistance disposed above the base body; a lid member occluding the furnace body; a heater disposed inside the furnace body; a high frequency coil heating the heater through high frequency induction heating; and a crucible heated with the heater, the heater containing a Pt-based alloy and having a zirconia coating on an overall surface of the heater.

First claim

What is claimed is:

1. An apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere, comprising: a base body; a bottomed cylindrical furnace body having heat resistance and being disposed on the base body; a lid member occluding the furnace body; a heater being provided on a bottom portion of the furnace body and being formed into a cylindrical shape having a ceiling; a high frequency coil heating the heater through high frequency induction heating; and a crucible being provided in the heater and heated by the heater,
wherein the heater is a Pt—Rh alloy heater and an overall surface of the heater is coated with zirconia.

2. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 1 , wherein the Pt—Rh alloy heater has a Rh content of from 10 to 30 wt %.

3. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 1 , wherein the crucible is a Pt—Rh alloy crucible, and a single crystal of β-Ga 2 O 3 is produced.

4. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 2 , wherein the crucible contains a Pt—Rh alloy, and a single crystal of β-Ga 2 O 3 is produced.

5. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 3 , wherein the Pt—Rh alloy crucible has a Rh content of from 10 to 30 wt %.

6. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 4 , wherein the Pt—Rh alloy crucible has a Rh content of from 10 to 30 wt %.

7. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 1 , wherein the crucible is a Pt crucible, and a single crystal of LiTaO 3 is produced.

8. The apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere according to claim 2 , wherein the crucible is a Pt crucible, and a single crystal of LiTaO 3 is produced.

9. An apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere, comprising: a base body; a bottomed cylindrical furnace body having heat resistance and being disposed on the base body; a lid member occluding the furnace body; a heater being provided on a bottom portion of the furnace body and being formed into a cylindrical shape having a ceiling; a high frequency coil heating the heater through high frequency induction heating; and a crucible being provided in the heater and heated by the heater,
wherein the heater is a Pt—Rh alloy heater and an overall surface of the heater is coated with zirconia, and
a notch is provided in a lower part of the cylindrical heater which is provided on the bottom portion of the furnace body.

10. The apparatus according to claim 9 ,
wherein Pt—Rh alloy heater has a Rh content of from 10 to 30 wt %,
the crucible is a Pt—Rh alloy crucible having a Rh content of from 10 to 30 wt %, and
the apparatus produces a β-Ga 2 O 3 single crystal.

11. An apparatus for producing a single crystal of a metal oxide in an oxidative atmosphere, comprising: a base body; a bottomed cylindrical furnace body having heat resistance and being disposed on the base body; a lid member occluding the furnace body; a heater being provided on a bottom portion of the furnace body and being formed into a cylindrical shape having a ceiling; a high frequency coil heating the heater through high frequency induction heating; and a crucible being provided in the heater and heated by the heater,
wherein the heater is a Pt—Rh alloy heater and an overall surface of the heater is coated with zirconia, and
a lower part of the cylindrical heater which is provided on the bottom portion of the furnace body, has a smaller thickness than other parts.

12. The apparatus according to claim 11 ,
wherein the Pt—Rh alloy heater has a Rh content of from 10 to 30 wt %,
the crucible is a Pt—Rh alloy crucible having a Rh content of from 10 to 30 wt %, and
the apparatus produces a β-Ga 2 O 3 single crystal.

Assignees

• Fujikoshi Machinery Corp
• Univ Shinshu

Inventors

• Hoshikawa Keigo
• Fujiwara Yasuyuki
• Kohama Keiichi
• Nakanishi Shinji
• Kobayashi Takumi
• Ohba Etsuko

Classifications

• C30B11/002 Primary

  Crucibles or containers for supporting the melt · CPC title

• C22C5/04

  Alloys based on a platinum group metal · CPC title

• C30B29/16 Primary

  Oxides · CPC title

• C30B29/30

  Niobates; Vanadates; Tantalates · CPC title

• C30B11/003

  Heating or cooling of the melt or the crystallised material · CPC title