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10‐mol%‐Gd 2 O 3 ‐Doped CeO 2 Solid Solutions via Carbonate Coprecipitation: A Comparative Study
Author(s) -
Li JiGuang,
Ikegami Takayasu,
Wang Yarong,
Mori Toshiyuki
Publication year - 2003
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.1151-2916.2003.tb03397.x
Subject(s) - coprecipitation , sintering , materials science , scanning electron microscope , carbonate , thermogravimetry , solid solution , ammonium carbonate , doping , inorganic chemistry , nuclear chemistry , oxide , mineralogy , ammonium bicarbonate , calcination , analytical chemistry (journal) , chemistry , metallurgy , catalysis , organic chemistry , raw material , optoelectronics , composite material
10mol% Gd 2 O 3 ‐doped CeO 2 solid solutions (20GDC) have been synthesized via carbonate coprecipitation using ammonium bicarbonate (AHC) and urea as the precipitants. The precursors and the resultant oxide powders were characterized via chemical analysis, X‐ray diffractometry (XRD), Brunauer–Emmett–Teller (BET) analysis, and high‐resolution scanning electron microscopy (HRSEM). Sinterabilities of the 20GDC oxides in air were studied by constant‐rate‐of‐heating (CRH) sintering and the conventional ramp‐and‐holding sintering methods. The precursor processed by both methods is hydroxyl carbonate but shows quite different particle morphologies in the two cases. Highly sinterable 20GDC oxides that can be densified to >99% of the theoretical at 1050°C within 4 h have been obtained via the AHC method.