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Low‐Temperature Synthesis of Praseodymium‐Doped Ceria Nanopowders
Author(s) -
Wang Yarong,
Mori Toshiyuki,
Li JiGuang,
Ikegami Takayasu
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.tb00591.x
Subject(s) - praseodymium , coprecipitation , thermal decomposition , calcination , materials science , crystallite , ammonium carbonate , oxide , sintering , inorganic chemistry , doping , carbonate , solid solution , nuclear chemistry , mineralogy , chemical engineering , chemistry , metallurgy , catalysis , organic chemistry , optoelectronics , engineering
Praseodymium‐doped ceria (CeO 2 ) nanopowders have been synthesized via a simple but effective carbonate‐coprecipitation method, using nitrates as the starting salts and ammonium carbonate as the precipitant. The precursors produced in this work are ammonium rare‐earth double carbonates, with a general formula of (NH 4 ) 0.16 Ce 1− x Pr x (CO 3 ) 1.58 ·H 2 O (0 < x ≤ 0.20), which directly yield oxide solid solutions on thermal decomposition at a very low temperature of ∼400°C. Praseodymium doping causes a gradual contraction of the CeO 2 lattice, because of the oxidation of Pr 3+ to smaller Pr 4+ , and suppresses crystallite coarsening of the oxides during calcination. Dense ceramics have been fabricated from the thus‐prepared nanopowders via pressureless sintering for 4 h at a low temperature of 1200°C.