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Enhanced Activation Energy of Crystallization of Pure Zirconia Nanopowders Prepared via an Efficient Way of Synthesis Using NaBH 4
Author(s) -
Nayak Nadiya B.,
Nayak Bibhuti B.,
Mondal Aparna
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.12605
Subject(s) - crystallization , crystallite , cubic zirconia , activation energy , borohydride , chemical engineering , materials science , amorphous solid , exothermic reaction , precipitation , chemistry , crystallography , catalysis , organic chemistry , composite material , metallurgy , ceramic , physics , meteorology , engineering
An efficient way through borohydride synthesis route using NaBH 4 was performed to prepare pure zirconia nanopowders via three different conditions such as gelation, precipitation, and constant pH. Zirconia powders prepared through constant pH route show highest activation energy of crystallization ( E a = 260 kJ/mol) or higher exothermic peak temperature (717°C), when compared with gelation or precipitation route due to its controlled growth of smaller crystallites. The released huge amount of H 2 gas bubbles during borohydride synthesis via constant pH route play a major role for formation of loose smaller crystallites and thus enhances the activation energy of crystallization of pure zirconia. So, the as‐prepared zirconia powders prepared through constant pH route remain amorphous up to 600°C and pure t‐ZrO 2 (~20 nm) was stable up to 800°C.