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Title: Mechanochemical synthesis of nano-sized CeO{sub 2}

Abstract

Nano-sized ceramic and metal powders have potential applications in oxygen transport membranes, solid oxide fuel cells (SOFCs), and catalysts, etc. Several processing routes, including vapor decomposition, glycline or urea nitrate synthesis, thermal decomposition and precipitation, are presently being investigated to synthesize nano-sized ceramic powders. Typically the synthesis begins with high-energy mechanical milling and mixing of stoichiometric amounts of the precursors. The high-energy mechanical milling results in a nano-scale mixture of the precursors. Sometimes, the mechanical milling results in the formation of the product without an additional heating step. This was the case in the synthesis of Fe powder from FeCl{sub 3} and Na. More commonly, heating of the mechanically milled mixture to between 300 and 500 C is required for completion of the displacement reaction and formation of the desired phase. Indeed, heating of the mechanically milled precursors was required in the synthesis of {gamma}-Al{sub 2}O{sub 3} and ZrO{sub 2} by Ding et al. An obvious pre-requisite for this method to work is a favorable thermodynamic driving force. CaO and CeCl{sub 3} have been used to prepare CeO{sub 2}.

Authors:
;
Publication Date:
Research Org.:
Siemens Westinghouse Power Corp., Pittsburgh, PA (US)
OSTI Identifier:
20075990
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 42; Journal Issue: 10; Other Information: PBD: 10 May 2000; Journal ID: ISSN 1359-6462
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; SYNTHESIS; CERIUM OXIDES; CHEMICAL REACTIONS; CALCIUM OXIDES; CERIUM CHLORIDES; MILLING; ANNEALING; X-RAY DIFFRACTION

Citation Formats

Gopalan, S., and Singhal, S.C. Mechanochemical synthesis of nano-sized CeO{sub 2}. United States: N. p., 2000. Web. doi:10.1016/S1359-6462(00)00328-6.
Gopalan, S., & Singhal, S.C. Mechanochemical synthesis of nano-sized CeO{sub 2}. United States. doi:10.1016/S1359-6462(00)00328-6.
Gopalan, S., and Singhal, S.C. Wed . "Mechanochemical synthesis of nano-sized CeO{sub 2}". United States. doi:10.1016/S1359-6462(00)00328-6.
@article{osti_20075990,
title = {Mechanochemical synthesis of nano-sized CeO{sub 2}},
author = {Gopalan, S. and Singhal, S.C.},
abstractNote = {Nano-sized ceramic and metal powders have potential applications in oxygen transport membranes, solid oxide fuel cells (SOFCs), and catalysts, etc. Several processing routes, including vapor decomposition, glycline or urea nitrate synthesis, thermal decomposition and precipitation, are presently being investigated to synthesize nano-sized ceramic powders. Typically the synthesis begins with high-energy mechanical milling and mixing of stoichiometric amounts of the precursors. The high-energy mechanical milling results in a nano-scale mixture of the precursors. Sometimes, the mechanical milling results in the formation of the product without an additional heating step. This was the case in the synthesis of Fe powder from FeCl{sub 3} and Na. More commonly, heating of the mechanically milled mixture to between 300 and 500 C is required for completion of the displacement reaction and formation of the desired phase. Indeed, heating of the mechanically milled precursors was required in the synthesis of {gamma}-Al{sub 2}O{sub 3} and ZrO{sub 2} by Ding et al. An obvious pre-requisite for this method to work is a favorable thermodynamic driving force. CaO and CeCl{sub 3} have been used to prepare CeO{sub 2}.},
doi = {10.1016/S1359-6462(00)00328-6},
journal = {Scripta Materialia},
issn = {1359-6462},
number = 10,
volume = 42,
place = {United States},
year = {2000},
month = {5}
}