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Synthesis and Characterization of MgAl 2 O 4 Spinel Precursor from a Heterogeneous Alkoxide Solution Containing Fine MgO Powder
Author(s) -
Shiono Takeshi,
Shiono Koji,
Miyamoto Kazuyo,
Pezzotti Giuseppe
Publication year - 2000
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.1151-2916.2000.tb01180.x
Subject(s) - boehmite , spinel , alkoxide , calcination , hydroxide , crystallite , sintering , materials science , decomposition , inorganic chemistry , mineralogy , chemical engineering , chemistry , metallurgy , catalysis , aluminium , organic chemistry , engineering
A precursor was synthesized from a heterogeneous alkoxide solution that contained fine MgO powder, which allowed the preparation of MgAl 2 O 4 spinel powder with high sinterability characteristics. The precursor consisted of a mixture of boehmite (AlO(OH)) and a mixed hydroxide (Mg 4 Al 2 (OH) 14 · 3H 2 O). The spinel phase formed through two steps: (i) decomposition of the mixed hydroxide at low temperature and (ii) solid‐state reaction between MgO and γ‐Al 2 O 3 at higher temperatures. Dense polycrystalline spinel could be obtained from the calcined powders at sintering temperatures as low as 1400°C.