SOLID BODY HAVING DYING PROPERTIES

Abstract

The invention relates to a solid body of a compound of formula Zn.sub.1-t-eT.sub.tE.sub.eO.sub.1-yY.sub.y, wherein the compound has a wurtzite structure and wherein T represents one or more transition metals, selected from one or more of Mn, Cd, Cr, Fe, Co and Ni; E represents one or more alkaline earth metals, selected from one or more of Be, Mg, Ca, Sr and Ba; Y represents one or more chalcogens, selected from S, Se, Te; tis a value in the region of 0 to <1; e is a value from 0 to <1, and y is a value from 0 to <1.

Claims

1. A solid body of a compound of formula Zn1-t-eTtEeO1-yYy, wherein the compound has a wurtzite structure, and wherein T represents one or more transition metals, selected from Mn, Cd, Cr, Fe, Co and Ni, E represents one or more alkaline earth metals, selected from Be, Mg, Ca, Sr and Ba, Y represents one or more chalcogens, selected from S, Se, Te, t is a value in the range of from 0 to <1, e is a value from 0 to <1, and t+e<1 y is a value from 0 to <1.

2. The solid body according to claim 1, wherein t is a value from 0.02 to 0.80, especially 0.05 to 0.65.

3. The solid body according to claim 1, wherein e is a value from 0.00 to 0.85, especially 0.00 to 0.60.

4. The solid body according to claim 1, wherein y is a value from 0.00 to 0.75, especially 0.00 to 0.70.

5. The solid body according to claim 1, wherein T is in the form of Mn.

6. The solid body according to claim 1, wherein E is in the form of Mg, Ca and/or Sr.

7. The solid body according to claim 1, wherein Y is in the form of S.

8. The solid body according to claim 1, wherein Y is in the form of a mixture of S and Se, especially with a molar ratio of S:Se in the range of from 1.00 to 0.00, especially 0.95 to 0.05.

9. The solid body according to claim 1, wherein the solid body is single-phase.

10. A method for producing a solid body according to claim 1, wherein the method comprises the following steps: providing at least one compound which comprises at least one of the transition metals T, providing at least one compound which comprises at least one of the alkaline earth metals E, providing at least one compound which comprises at least one of the chalcogens Y, wherein at least one of the provided compounds is substantially water-insoluble and at least one of the provided compounds is substantially water-soluble, incorporating the at least one substantially water-insoluble compound in an aqueous medium, dissolving the at least one substantially water-soluble compound in the aqueous medium, changing a state, especially the pH value, of the aqueous medium, such that the at least one substantially water-insoluble compound is converted into at least one water-insoluble compound, and separating the solids from the aqueous medium by decanting, filtration or centrifugation, calcining the separated solid.

11. A solid body produced in accordance with the method according to claim 10.

12. A composition comprising of a solid body according to claim 1.

13. The composition of claim 12, wherein the composition is a plastics material, paint, or varnish.

Description

EXAMPLE

[0088] A suspension of 48.81 g zinc oxide (NORKEM) in 610 ml demineralised water was prepared in a 2 l glass beaker under stirring. 20.28 g manganese sulfate monohydrate (commercially, CG-Chemikalien) dissolved in 300 ml demineralised water were added within 5 minutes. The mixture was stirred for 20 minutes. The pH was set to 7.4 using 5% NaOH. A solution of 33,12 sodium sulfide nonahydrate (32.5% Na.sub.2S, Merck) in 270 ml demineralised water was added dropwise within 10 minutes under stirring. 8.76 g calcium carbonate (ALDRICH, >99.0%) were stirred in. The mixture was stirred for 30 minutes and left to stand overnight. The precipitate was separated off using a Buchner funnel, and the filter cake was washed salt-free and pH-neutral. The press cake was dried in a drying cabinet at 80° C., then pulverised by means of a laboratory mill.

[0089] The resultant raw mixture was calcined in aluminium oxide dishes (GTS) in a nitrogen atmosphere for example 4.6 in a tube reactor (HTM Reetz GmbH) at 1080° C. The reaction time was 120 minutes.

[0090] The calcinate was micronised in an aqueous medium by means of an agitator bead mill (Mini mill, EIGER TORRANCE). The ground material was evaporated to dryness and pulverised by means of an ultra-centrifugal mill (ZM 200, RETSCH). An orange-red powder with low hardness was produced.

[0091] The product was finely ground in a medium-oil air-drying alkyd varnish by means of a universal mixer (Hauschild). After application of the pigmented varnish to substrate sheet 103 (VOLKEL), the shade of colour was assessed visually and by means of spectral photometer. Chromophoric properties and stabilities were determined by further tests in other varnish systems, different plastics materials and façade coatings.