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Effect of Controlling Parameters on the Reaction Sequences of Formation of Nitrogen‐Containing Magnesium Aluminate Spinel from MgO, Al 2 O 3 , and AlN
Author(s) -
Bandyopadhyay Siddhartha,
Rixecker Georg,
Aldinger Fritz,
Maiti Himadri Sekhar
Publication year - 2004
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.1551-2916.2004.00480.x
Subject(s) - spinel , isothermal process , magnesium , aluminate , chemistry , oxygen , reactivity (psychology) , aluminium , inorganic chemistry , nitrogen , reaction mechanism , thermodynamics , materials science , chemical engineering , catalysis , metallurgy , organic chemistry , medicine , physics , alternative medicine , pathology , cement , engineering
The reaction sequences of the formation of nitrogen‐containing magnesium aluminate spinel from MgO, Al 2 O 3 , and AlN were investigated as a function of temperature through dilatometric study and as a function of time through isothermal heat treatments. The natures of reactions are described through the appearance of phases in conjunction with densification behavior and the change in lattice parameter of the spinel phase. Although the dilatometric study provides the detail insights of the formation sequence, the isothermal runs reveal new information about the differential rate of reactivity of the reacting species that suggested a tentative controlling mechanism. Through the initial formation of magnesium aluminate, oxygen‐rich solid solution (MgAlON) forms, which ultimately reacts with the rest of AlN to reach its nominal composition. Nitrogen diffusion through MgAlON lattice seems to be rate controlling.