Method of producing tantalum (V) nitride

US5376349A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Martin Jansen · Bonn, DE
• Hans-Peter Letschert · Bonn, DE
• Dietrich Speer · Hanau, DE

Key dates

• Filing date: Oct 14, 1993
• Grant date: Dec 27, 1994
• Expiry date: Oct 14, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/84
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An improved method for producing tantalum (V) nitride by means of nitriding an oxidic tantalum (V) compound is described. The Ta.sub.3 N.sub.5 product obtained in accordance with this method may be used as a red coloring pigment, particularly for coloring plastics and varnishes. An improved color intensity can be achieved and/or the reaction time can be shortened using the process in accordance with the invention. The process includes nitriding tantalum (V) hydrated oxide with the composition of the formula Ta.sub.2 O.sub.5 .multidot.aq with a hydrate content (i.e., aq content) in a range of 14 to 17% by weight. The nitridation preferably takes place in the presence of a fluxing agent such as ammonium carbonate or boric acid.