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Mechanical Activation of Heterogeneous Sol–Gel Precursors for Synthesis of MgAl 2 O 4 Spinel
Author(s) -
Ye Guotian,
Troczynski Tom
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00533.x
Subject(s) - spinel , activation energy , decomposition , mineralogy , materials science , chemical engineering , chemistry , inorganic chemistry , metallurgy , organic chemistry , engineering
MgAl 2 O 4 spinel precursor was prepared using a heterogeneous sol–gel process. The effect of high‐energy milling on the precursor decomposition and spinel formation was investigated. The milling decreased the Al(OH) 3 dehydroxylation temperature from 190° to about 130°C. The activation energy for spinel formation decreased from 688 kJ/mol for the as‐prepared precursors to 468 kJ/mol for the precursors milled for 5 h. Milling of the precursor lowered the incipient temperature of spinel formation from 900° to 800°C, and the temperature of complete MgAl 2 O 4 spinel formation from >1280° to ∼900°C.