Precursor composition for alkaline earth metal containing ceramic layers

Patent metadata

Field	Value
Publication number	US-2016343933-A1
Application number	US-201415034346-A
Country	US
Kind code	A1
Filing date	Oct 30, 2014
Priority date	Nov 5, 2013
Publication date	Nov 24, 2016
Grant date	—

Abstract

The present invention deals with precursor composition for alkaline earth metal containing ceramic layers. In particular, the present invention pertains to a precursor composition containing:(i) one or more soluble compounds of transition metals (ii) one or more soluble compounds of alkaline earth metals (iii) one or more soluble compounds of rare earth metals (iv) difluorinated carboxylate and/or partly fluorinated propionates (v) one or more solvents, wherein the difference between the boiling points of the corresponding acid of the components (i) to (iii) to the boiling point of component (iv) is less than 60 K.

First claim

1 . A precursor composition, comprising:
(i) one or more soluble compounds of transition metals; (ii) one or more soluble compounds of alkaline earth metals; (iii) one or more soluble compounds of rare earth metals; (iv) difluorinated acetate and/or partly fluorinated propionate compound(s); and (v) one or more solvents, wherein the difference between the boiling points of the corresponding acid of the components (i) to (iii) to the boiling point of component (iv) is less than 60 K.

2 . The precursor composition of claim 1 , wherein the difference between the boiling points of the corresponding acid of the components (i) to (iii) to the boiling point of component (iv) is less than 40 K.

3 . The precursor composition of claim 1 , wherein the boiling points of all corresponding acids of the components (i) to (iii) are higher than the boiling point of component (v).

4 . The precursor composition of claim 1 , wherein the difference between the boiling points of the corresponding acid of the components (i) to (iii) and of component (iv) is more than 10 K to the boiling point of component (v), the solvent.

5 . The precursor composition of claim 1 , wherein the precursor composition contains Ethylcellulose as an additive.

6 . The precursor composition of claim 1 , wherein an alkaline earth metal di fluorinated acetate is used as components (ii) and (iv).

7 . The precursor composition of claim 1 , wherein propionates are used as soluble compounds of the components (i) and/or (iii).

8 . A process of forming a high temperature superconductor, the process comprising disposing the precursor composition of claim 1 on the surface of an underlying layer.

9 . The process of claim 8 , wherein the precursor composition is disposed using spin coating, slot coating, gravure coating, dip coating, tape casting, spraying or ink-jet printing.

10 . The process of claim 8 , wherein the precursor composition disposed on the surface of the underlying layer is heated to form a layer of superconductor material.

11 . The process of claim 10 , wherein the heating is conducted as a two or three-step process including at least one heating step up to less than 500° C. in a water vapour containing flowing gas atmosphere and at least one heating step at about 550° C. to 700° C. in an O-reduced wet atmosphere.

12 . The process of claim 11 , wherein the gas atmosphere is in turbulent flow at the film substrate.

Assignees

• Basf Se

Inventors

• Baecker Michael
• Falter Martina
• Bennewitz Jan
• Steinberg Christoph
• Werner Christian

Classifications

• C09D11/52

  Electrically conductive inks · CPC title

• C04B2235/6588

  Water vapor containing atmospheres · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title

• C04B35/6325

  based on organo-metallic compounds · CPC title

• C04B2235/3282

  Cuprates · CPC title