Method for making iron telluride

Patent metadata

Field	Value
Publication number	US-11525190-B2
Application number	US-202117328267-A
Country	US
Kind code	B2
Filing date	May 24, 2021
Priority date	Mar 26, 2021
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

The disclosure relates to a method for making an iron telluride including placing Fe, Bi, and Te in a reacting chamber as reacting materials. The reacting chamber is evacuated to be a vacuum with a pressure lower than 10 Pa. The reacting chamber is heated to a first temperature of 700 degrees Celsius to 900 degrees Celsius and keeping the first temperature for a period of 10 hours to 14 hours. Then the reacting chamber is cooled to a second temperature of 400 degrees Celsius to 700 degrees Celsius within 60 hours to 75 hours and keeping the second temperature for a period of 40 hours to 50 hours, to obtain a reaction product including a FeTe0.9 single crystal. The FeTe0.9 single crystal is separated from the reaction product.

First claim

What is claimed is:

1. A method of making iron telluride, comprising:
providing a reacting chamber defining an open end and a sealed end opposite to the open end;
placing quartz slags at the sealed end and quartz wool on the top of the quartz slags;
placing reaction materials in the reacting chamber, wherein the reaction materials comprise Fe (Iron), Bi (bismuth), and Te (tellurium); and a molar ratio of Fe, Bi, and Te is in a range from 1:5:4 to 1:10:4;
evacuating the reacting chamber and sealing the open end;
flipping the reacting chamber in a sleeve, so that, due to gravity, the reacting materials are at a bottom of the reacting chamber, and the quartz slag and the quartz wool are at a top of the reacting chamber;
heating the sleeve to a first temperature of 700 degrees Celsius to 900 degrees Celsius and maintaining the sleeve at the first temperature for a period of 10 hours to 14 hours;
cooling the sleeve to a second temperature of 400 degrees Celsius to 700 degrees Celsius within 60 hours to 75 hours and maintaining the sleeve at the second temperature for a period of 40 hours to 50 hours, to obtain a reaction product comprising FeTe 0.9 single crystals; and
separating the FeTe 0.9 single crystals from the reaction product by flipping the sleeve.

2. The method of claim 1 , wherein the iron telluride comprises FeTe 0.9 single crystals.

3. The method of claim 1 , wherein the quartz slags are placed between the sealed end and the quartz wool.

4. The method of claim 1 , wherein a molar ratio of Fe, Bi, and Te is 1:7:4.

5. The method of claim 1 , wherein the reacting chamber is evacuated to a vacuum than 10 Pa.

6. The method of claim 5 , wherein the vacuum is lower than 1 Pa.

7. The method of claim 1 , wherein a method of sealing the open end comprises fast heating the open end by a flame.

8. The method of claim 1 , wherein flipping the reacting chamber in the sleeve comprises filling fire-resistant cotton between the reacting chamber and the sleeve.

9. The method of claim 1 , wherein separating the FeTe 0.9 single crystals from the reaction product further comprises centrifuging the reaction product.

10. The method of claim 9 , wherein the reaction product is centrifuged at 2000 rpm to 3000 rpm for 100 seconds to 200 seconds.

11. The method of claim 10 , wherein the reaction product is centrifuged at 2500 rpm for 150 seconds.

12. A method for making an iron telluride, comprising:
placing Fe (Iron), Bi (bismuth), and Te (tellurium) in a reacting chamber as reacting materials;
evacuating the reacting chamber to be vacuum with a pressure lower than 10 Pa;
heating the reacting chamber to a first temperature of 700 degrees Celsius to 900 degrees Celsius and keeping the first temperature for a period of 10 hours to 14 hours;
cooling the reacting chamber to a second temperature of 400 degrees Celsius to 700 degrees Celsius within 60 hours to 75 hours and keeping the second temperature for a period of 40 hours to 50 hours, to obtain a reaction product including a FeTe 0.9 single crystal; and
separating the FeTe 0.9 single crystal from the reaction product.

13. The method of claim 12 , wherein the iron telluride is a FeTe 0.9 single crystal.

14. The method of claim 12 , wherein a molar ratio of Fe, Bi, and Te is in a range from 1:5:4 to 1:10:4.

15. The method of claim 14 , wherein a molar ratio of Fe, Bi, and Te is 1:7:4.

Assignees

• Univ Tsinghua
• Hon Hai Prec Ind Co Ltd

Inventors

• Li Hao
• Wu Yang
• Fan Shou-Shan

Classifications

• C30B29/46 Primary

  Sulfur-, selenium- or tellurium-containing compounds · CPC title

• C30B9/12

  Salt solvents, e.g. flux growth · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C30B29/52

  Alloys · CPC title