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A Novel Method of Synthesis of Nanostructured Aluminum Nitride Through Sol‐Gel Route by In Situ Generation of Nitrogen
Author(s) -
Ghosh Chaudhuri M.,
Basu J.,
Das G. C.,
Mukherjee S.,
Mitra M. K.
Publication year - 2013
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/jace.12111
Subject(s) - materials science , partial pressure , carbon fibers , carbothermic reaction , nitride , chemical engineering , nitrogen , oxygen , high resolution transmission electron microscopy , ammonia , aluminium , ambient pressure , hydrogen , layer (electronics) , composite material , nanotechnology , composite number , chemistry , transmission electron microscopy , organic chemistry , carbide , physics , engineering , thermodynamics
Nanostructured Aluminum Nitride ( AlN ) has been prepared by carbothermal reduction followed by nitridation ( CTRN ) of alumina gel over a temperature range 1200°C–1350°C and time period of 30 min to 3 h. Before heat treatment the gel is repeatedly evacuated and purged with ammonia. The nanopores of the gel are filled with ammonia which acts as a source of in situ nitrogen at heat‐treatment temperature. Dextrose also decomposes at the reduction temperature and generates ultrafine carbon. The stability diagram of the carbon saturated Al – N – O system is constructed and it shows that extremely low partial pressure of oxygen is required for the stability of AlN . The ultrafine carbon as well as hydrogen from the cracking of ammonia is not sufficient to create the extremely low partial pressure of oxygen required for the stabilization of AlN . So the sample is heat treated in charcoal boat in nitrogen atmosphere to achieve an extremely low partial pressure of oxygen required for the formation of AlN . The material has been characterized through XRD , FESEM , and HRTEM analyses. The spherical particle size of AlN is obtained ∼21 nm.