Transparent metal fluoride ceramic

Patent metadata

Field	Value
Publication number	US-9862648-B2
Application number	US-201515301597-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 4, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A method for producing a metal fluoride ceramic, comprising: providing a sedimented compound comprising metal fluoride particles having an average particle size lower than 30 nm and a solvent, partially drying the sedimented compound at a temperature lower than 65° C. until the partially dried compound comprises from 5 wt % to 45 wt % of the solvent, and sintering, for example in air, the partially dried and sedimented compound.

First claim

The invention claimed is:

1. A method for producing a metal fluoride ceramic, comprising:
providing a sedimented compound comprising metal fluoride particles having an average particle size lower than 30 nm and a solvent;
partially drying the sedimented compound at a temperature lower than 65° C. until the partially dried compound comprises from 5 wt % to 45 wt % of the solvent; and
sintering the partially dried and sedimented compound.

2. The method according to claim 1 , wherein providing a sedimented compound comprises:
centrifuging the metal fluoride particles in the solvent, and removing the supernate.

3. The method according to claim 1 , wherein the sintering is performed under air and under atmospheric pressure.

4. The method according to claim 1 , wherein the sedimented compound comprises about 60 wt % of solvent or less.

5. The method according to claim 1 , wherein the metal fluoride particles have a standard deviation of the particle size lower than 25 nm.

6. The method according to claim 1 , wherein the metal fluoride particles are selected from the group comprising MF2, AMF3, ABF4 and AB3F10, and a solid solution MF2-M′F2, wherein A is an alkali metal, B is a rare earth metal and M and M′ are an alkaline earth metal.

7. The method according to claim 6 , wherein A is selected from the group consisting of potassium, sodium, cesium and rubidium, B is selected from the group consisting of yttrium and lanthanides, and M and M′ are selected from the group comprising calcium, magnesium, barium and strontium.

8. The method according to claim 7 , wherein M is calcium.

9. The method according to claim 1 , wherein the metal fluoride particles further comprise at least one dopant.

10. The method according to claim 9 , wherein the dopant is selected from the group consisting of transition metals and rare earth metals.

11. The method according to claim 1 , wherein the metal fluoride particles are ytterbium (III) doped calcium fluoride particles.

12. The method according claim 1 , wherein the sintering is performed at a temperature ranging between 500° C. to 750° C.

13. The method according to claim 1 , wherein providing a sedimented compound comprises:
providing a mixture of a solvent and of metal fluoride particles, and
centrifuging the mixture for about 40 min or more, and removing the supernate.

Assignees

• Paris Sciences Et Lettres—Quartier Latin
• Centre National De La Recherche Scient (Cnrs)
• Univ Pierre Et Marie Curie Paris 6
• Univ Pierre Et Marie Curie Paris 6

Inventors

• Mortier Michel
• Aballea Pierre
• Gredin Patrick
• Suganuma Akiko

Classifications

• C04B2235/781

  Nanograined materials, i.e. having grain sizes below 100 nm · CPC title

• C04B35/62615

  High energy or reactive ball milling · CPC title

• C04B35/6263

  characterised by their solids loadings, i.e. the percentage of solids · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title

• C04B2235/668

  Pressureless sintering · CPC title