Journal
JOURNAL OF CHEMISTRY
Volume 2013, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2013/350937
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- Department of Science and Technology (DST), India [SR/S3/ME/03/2005-SERC-Engg]
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The thermal behaviour of tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)zirconium(IV), [Zr(tmhd)(4)] was investigated by nonisothermal and isothermal thermogravimetric methods in a high pure nitrogen atmosphere. The influence of the heating rate in dynamic measurements (6, 8, 10, and 12 degrees C/min) on activation energy was also studied. The nonisothermal sublimation activation energy values determined following the procedures of Arrhenius, Coats and Redfern, Kissinger, and Flynn-Wall yielded 76 +/- 5, 92 +/- 2, 81 +/- 8, and 72 +/- 7 kJ/mol, respectively, and the isothermal sublimation activation energy was found to be 87 +/- 4 kJ/mol over the temperature range of 411-462 K. Different reaction mechanisms were used to compare with this value. Analysis of the experimental results suggested that the actual reaction mechanism was an R-n type.
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