Tantalum (V) nitride pigments, process for the production thereof and use thereof
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United States of America Patent
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May 22, 2001
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N/A
app pub date -
Feb 22, 2000
filing date -
Feb 23, 1999
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Expired
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Abstract
Tantalum(V) oxide may be nitrided with ammonia at 700 to 1250.degree. C. to yield tantalum(V) nitride. According to the invention, nitriding and consequently pigment quality are improved by adding at least one pulverulent oxide from the series SiO.sub.2, GeO.sub.2, SnO.sub.2, TiO.sub.2, ZrO.sub.2 and HfO.sub.2 or a pulverulent precursor of such an oxide in a quantity of at least 0.1 wt. %, calculated as oxide, to the tantalum(V) oxide to be nitrided and then nitriding the powder mixture.
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