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Advances in Materials Science and Engineering
Volume 2009, Article ID 436729, 4 pages
http://dx.doi.org/10.1155/2009/436729
Research Article

Synthetic Conditions and Color Characteristics of Tantalum Oxynitride Prepared via Liquid- Process

Department of Applied Chemistry, School of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan

Received 24 August 2009; Accepted 7 October 2009

Academic Editor: Amit Bandyopadhyay

Copyright © 2009 Yo Sasaki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tantalum oxynitrides, such as TaON, exhibit promising color properties and can be employed as nontoxic yellow pigments containing no heavy metals. We have developed a process for preparing nitrides or oxynitrides involving the vacuum-calcination of a precursor material obtained via reaction between a metal halide and liquid . Herein, we describe the synthetic conditions of the liquid- process that affect the color, and thus the color characteristics, of the resulting pigments. Reaction and postreaction treatment conditions were adjusted to obtain the desired yellow color. The liquid- process was performed using 1.0 eq of (relative to ) as the oxygen source and 30.0 eq of KCl (relative to ) as flux. Calcination of the precursor at 1073 K under vacuum was followed by recalcination from room temperature to 973 K at rate of 10 K under air. A powder with a color index of , , and was obtained.