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The thermal decomposition of zirconium oxyhydroxide

Authors:

Affiliation:

(1) Faculty of Engineering, Shizuoka University, Hamamatsu 432, Japan;(2) Present address: Metallurgical Engineering Department, Queen's University, Kingston, Ontario, K7L 3N6, Canada;(3) 3-14-1, Daita, Setagaya-ku, Tokyo 155, Japan

Abstract:

The thermal decomposition of zirconium oxyhydroxides prepared by the mixture of aqueous zirconium oxychloride solutions and aqueous solutions of sodium hydroxide or ammonium hydroxide under various conditions has been examined by thermogravimetry, differential thermal analysis, X-ray diffraction study and infrared spectrophotometry. As a result, it is seen that the thermal decomposition of zirconium oxyhydroxide, in which the composition is ZrO_2-x(OH)_2x sdot

yH₂O where x

2 and 1

y<2, proceeds according to the following process:

$begin{gathered} {text{ ZrO}}_{{text{2}} - {text{x}}} ({text{OH}})_{2{text{x}}} cdot y{text{H}}_{text{2}} {text{O}} to {text{ amorphous ZrO}}_{text{2}} to hfill {text{metastable tetragonal ZrO}}_{text{2}} to {text{ monoclinic ZrO}}_{text{2}} hfill end{gathered}$

This revised version was published online in November 2005 with corrections to the Cover Date.

Keywords:

TG DTA thermal decomposition zirconium oxide zirconium oxyhydroxide

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