H. M. Ismail
Dec 1, 1995
Citations
1
Influential Citations
26
Citations
Journal
Powder Technology
Abstract
Abstract The thermal decomposition reactions of zirconium acetylacetonate in dry nitrogen were thoroughly studied. Thermal processes occurring throughout the decomposition range (100–800 °C) were monitored by means of thermogravimetry, differential thermal analysis and IR spectroscopic analysis of the gaseous products. These processes were characterized on the basis of the solid products analyses using X-ray diffractometry and IR spectroscopy. The results showed that the square antiprism Zr(C 5 H 7 O 2 ) 4 had completely decomposed to tetragonal ZrO 2 at 800 °C, through intermediates Zr(CH 3 COO) 2 (C 5 H 7 O 2 ) 2 at 190 °C, ZrO(CH 3 COO) 2 at 340 °C and ZrOCO 3 at 450 °C. The latter decomposed immediately to give ZrO 2 at 800 °C. Gas-phase products included propyne, acetone, carbon oxides, methane and isobutene. Methane and isobutene resulted from interfacial reaction involving the initial product (acetone). The texture analyses of the thermal decomposition products obtained at different temperatures (300–800 °C) were assessed by the analysis of nitrogen isotherms, using a number of widely accepted methods. The results of nitrogen adsorption, scanning electron microscopy and X-ray diffractometry showed that the final product ZrO 2 developed micro- and mesoporous texture and a growing crystallinity.