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Characterization of Products Obtained during Formation of Barium Monoaluminate through Hydrothermal Precipitation–Calcination Route
Author(s) -
Mishra Devabrata,
Anand Shashi,
Panda Rama Krushna,
Das Radhanath Prasad
Publication year - 2002
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.1151-2916.2002.tb00108.x
Subject(s) - barium carbonate , calcination , barium , boehmite , materials science , precipitation , inorganic chemistry , aqueous solution , mineralogy , chemistry , aluminium , metallurgy , organic chemistry , raw material , physics , meteorology , catalysis
Nanosized (10–30 nm particle size) hexagonal barium monoaluminate, having a high surface area of ∼30 m 2 /g, was synthesized by calcination of hydrothermally prepared precursors. The precursors were obtained by hydrolytic precipitation, using a mixed solution of barium and aluminum nitrates in the presence of aqueous urea at 180°C. Based on the results of XRD, FTIR, SEM/EDS, TEM, and TG‐DTA studies, the most probable sequence of reactions leading to the formation of barium monoaluminate was (i) conversion of aqueous barium and aluminum nitrates in the presence of urea by hydrothermal precipitation to crystalline orthorhombic barium carbonate and boehmite, (ii) formation of an interim form consisting of amorphous fibrillar aluminum oxide(s) interlaced with crystalline barium carbonate in the calcination temperature range of ∼500°–800°C, (iii) initiation of formation of barium monoaluminate at 1000°C, and (iv) formation of a near monophase nanosized barium monoaluminate at 1200°C.