Process for producing crystalline tantalum oxide particles

Patent metadata

Field	Value
Publication number	US-10233091-B2
Application number	US-201615554756-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Mar 2, 2015
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

The present invention is in the field of processes for the production of tantalum oxide particles. In particular the present invention relates to a process for producing crystalline tantalum oxide nanoparticles comprising heating a water-free solution containing (a) a tantalum alkoxide, (b) an acid, and (c) a solvent.

First claim

The invention claimed is:

1. A method for producing a superconductor, the method comprising:
depositing an ink comprising:
(a) an yttrium or rare earth-containing compound,
(b) an alkaline earth metal-containing compound,
(c) a transition metal-containing compound, and
(d) an alcohol, and
(e) crystalline particles

on a substrate, followed by heating to form the superconductor,
wherein said crystalline particles comprise tantalum oxide, have a degree of crystallinity of at least 70%, and have a weight average diameter of 1 to 20 nm.

2. The method according to claim 1 , wherein the substrate has multiple buffer layers thereon, and the ink is deposited on a buffer layer furthest from the substrate.

3. The method according to claim 2 , wherein the substrate has two buffer layers thereon.

4. The method according to claim 3 , wherein a first buffer layer comprises lanthanum zirconate and a second buffer layer comprises cerium oxide.

5. The method according to claim 1 , further comprising coating the superconductor with a conductive metal.

6. The method according to claim 5 , wherein the conductive metal is copper.

7. The method according to claim 1 , wherein said crystalline particles have a weight average diameter of 4 to 8 nm.

8. The method according to claim 7 , wherein said crystalline particles have a degree of crystallinity of at least 90%.

9. The method according to claim 1 , wherein the superconductor comprises REBa 2 Cu 3 O 7-x , wherein RE stands for rare earth and x is from 0.01 to 0.3.

10. The method according to claim 1 , wherein the crystalline particles have a particle size distribution D 90 /D 50 that is 1.2 or less.

11. The method according to claim 1 , wherein the substrate is textured.

12. The method according to claim 1 , wherein the substrate has a buffer layer thereon, and the ink is deposited on the buffer layer.

13. The method according to claim 1 , wherein the crystalline particles further comprise a compound of formula (I):

wherein a is 0 to 5, and
b and c are, independent of each other, 1 to 14, and
n is 1 to 5.

14. The method according to claim 1 , wherein the crystalline particles further comprise a compound of formula (II):

wherein R 1 and R 2 are, independent of each other, H, OH, or COOH, and
m is 1 to 12.

15. The method according to claim 1 , wherein the crystalline particles further comprise a compound of formula (I):

wherein e and fare, independent of each other, 0 to 12.

16. The method according to claim 1 , wherein the crystalline particles further comprise a compound of formula (IV):

wherein f is 0 to 5, and
p and q are, independent of each other, 1 to 14.

17. The method according to claim 1 , wherein said crystalline particles have a degree of crystallinity of at least 90%, and have a weight average diameter of 3 to 10 nm.

18. The method according to claim 1 , wherein said crystalline particles have a degree of crystallinity of at least 90%.

19. The method according to claim 4 , wherein said ink comprises 0.1 to 5 weight % of said crystalline particles with regard to the ink.

Assignees

• Basf Se

Inventors

• Driessche Isabel Van
• De Keukeleere Katrien
• De Roo Jonathan
• Zeger Hens

Classifications

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01G35/00 Primary

  Compounds of tantalum · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2004/52

  highly monodisperse size distribution · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title