Colored pigments based on oxide-nitrides, the preparation and use thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 16, 1998
Grant Date -
N/A
app pub date -
Aug 21, 1995
filing date -
Aug 19, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Colored pigments are provided from the green-yellow to red spectrum based on oxide-nitrides with two or three different cations Q, R and S in the crystal lattice, wherein the nitrogen to oxygen atomic ratio is determinative for the color. These pigments crystallise in the pyrochlore, spinel or elpasolite structure. Pigments in the perovskite are as provided with increased color brilliance. The color of the pigments can be adjusted in a wide range of the color spectrum during their preparation within a substance class with the cations Q, R and S and while retaining the crystal structure, by increasing or lowering the atomic ratio N to O in the oxide-nitride and bringing about the required charge balancing by replacing an equivalent quantity of the cation Q with the valency q by a cation R with the valency q+1. In order to prepare the pigments, a mixture of oxide-nitride-forming metal compounds in the atomic ratio of the cations according to the structural formula is calcined, preferably in the presence of mineralizers, under nitriding conditions at 700.degree.-1250.degree. C.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully