NDLI: Effect of NH$_{4}$F additive on purification of AlN ceramics

Content Provider	Springer Nature Link
Author	Wang, Dandan Wang, Chuanbin Li, Meijuan Shen, Qiang Zhang, Lianmeng
Copyright Year	2017
Abstract	In order to overcome the purification difficulty of aluminum nitride (AlN) ceramics, the sintering of AlN ceramics with ammonium fluoride (NH$_{4}$F) as an additive had been studied. The results demonstrate that the addition of NH$_{4}$F evidently affects the phase compositions, the microstructure of grains and the contents of oxygen and nitrogen in the AlN sintered samples. NH$_{4}$F not only removes oxygen out of AlN grains but also reduces the total oxygen content in AlN ceramics. It is found that relatively high purity of AlN can be acquired when the molar ratio of NH$_{4}$F/O (oxygen element in raw AlN powder) increases to 0.8. With adequate amount of NH$_{4}$F, the Al–O–N phases are removed. SEM and TEM results show the hexagonal structures of AlN grains with clean triple-grain junctions. The oxygen content decreases to 0.55 wt% and nitrogen content increases to 33.7 wt%. Thermodynamic analysis illustrates the oxygen removing effects of NH$_{4}$F by the reaction of NH$_{3}$ and Al$_{2}$O$_{3}$, which inhibits the formation of Al–O–N. NH$_{4}$F should be at least 2/3 of the oxygen content.
Starting Page	6731
Ending Page	6736
Page Count	6
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	9
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2017-01-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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