Ceramic pigments on apatite basis

• US 20050223944A1
• Filed: 06/27/2003
• Published: 10/13/2005
• Est. Priority Date: 06/28/2002
• Status: Active Grant

• Current Assignee: Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften e.V. (Max-Planck-Gesellschaft zur Frderung der Wissenschaften e)
• Original Assignee: Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften e.V. (Max-Planck-Gesellschaft zur Frderung der Wissenschaften e)
• Inventors: Karpov, Andrei S., Jansen, Martin, Kazin, Pavel E.
• Granted Patent: US 7,481,876 B2
• Time in Patent Office: Days
• US Class Current: 106/461
• CPC Class Codes: C01G 3/006 Compounds containing, besides copper, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01G 31/006 Compounds containing, besides vanadium, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/30 Three-dimensional structures
• CPC Class Codes: C01P 2002/84 by UV- or VIS- data
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C04B 14/366 Phosphates, e.g. apatite
• CPC Class Codes: C04B 2103/54 Pigments; Dyes

Abstract

The present invention relates to compounds on apatite basis, having the general formula M₅ (A0₄)₃X wherein X is situated in the hexagonal channels of the apatite structure and includes Cu-atoms, processes for the preparation thereof as well as applications of these compounds. The compounds presented herein are particularly useful as pigments.

Claims

1. A compound having the general formula (I)

M₅(AO₄)₃X,

wherein the group M₅(AO₄)₃ forms an apatite structure and X is situated in the hexagonal channels of the apatite structure and includes Cu-atoms, with the proviso that the compound is not Sr₅(VO₄)₃(CuO),Sr₅(VO₄)₃(Cu_0.894O_0.952), or (Sr_0.9Ca_0.1)₅(Cr^vO₄)₃(CuO).

2. The compound according to claim 1, wherein A represents P, V or a mixture thereof and M represents Ba, Sr, Ca or a mixture thereof.

3. The compound of claim 1, wherein X represents a mixture of Cu²⁺, Cu⁺, O²⁻

, OH⁻

, F⁻

, Cl⁻

, Br⁻

and/or 1⁻

.

4. The compound of claim 1, wherein X comprises copper ions.

5. The compound according to claim 1, wherein X comprises Cu²⁺.

6. The compound according to claim 1, wherein linear units O—

Cu—

O are present in the hexagonal channels of the apatite structure.

7. The compound according to claim 1 wherein X represents Cu_xO_yH_z, wherein O<

x≦

0.85, O≦

z<

1 and 0.5<

y≦

1.

8. The compound according to claim 7, wherein 0.1≦

x≦

0.6.

9. The compound according to claim 1, wherein A represents P.

10. A process for preparing a compound according to claim 1 comprising the steps:

(i) mixing of compounds comprising the elements M, A and X,

(ii) thermal treatment of the mixture in the range of 200 to 1700°

C. to yield a compound of the general formula (I).

11. The process according to claim 10, wherein the thermal treatment is performed for 0.01 to 60 hours.

12. The process according to claim 10, wherein the thermal treatment is performed when intermediate regrinding.

13. The process according to claim 10, wherein the thermal treatment of the mixture is performed in air, argon or oxygen.

14. The process according to claim 10, further comprising the step

(iii) thermal treatment of the compound obtained in step (ii) in oxygen, inert gas atmosphere or vacuum at 500 to 900°

C. for 0.5 to 24 hours.

15. The process for preparing a compound of claim 1 comprising the steps

(i) mixing of carbonates of M, (NH₄)H₂PO₄ and Cu-compounds,

(ii) thermal treatment of this mixture in solid state in air at 600 to 850°

C. for 1 to 5 hours,

(iii) regrinding,

(iv) thermal treatment at 1100 to 1400°

C. for about 1 to 24 hours,

(v) cooling and

(vi) regrinding.

16. Pigment comprising a compound of claim 1.

17. Pigment according to claim 15, wherein X in the compound of general formula (I) comprises Cu²⁺.

18. Use of a compound according to claim 1 as pigment, paint or as coloring additive in cements or plasters.

19. Pigment comprising a compound of claim 10.

20. Pigment comprising a compound of claim 15.