TY - JOUR
T1 - Enhancement of the oxygen storage properties of BaPrMn2O5 + δ and BaSmMn2O5 + δ oxides by a high-energy milling
AU - Klimkowicz, Alicja
AU - Świerczek, Konrad
AU - Yamazaki, Tetsuya
AU - Takasaki, Akito
N1 - Funding Information:
The project was funded by the National Science Centre Poland ( NCN ) on the basis of the decision number DEC-2011/01/B/ST8/04046 .
Publisher Copyright:
© 2016 Elsevier B.V.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/12/15
Y1 - 2016/12/15
N2 - A facile, mechanical milling method resulting in a significant improvement of the oxygen release kinetics from cation-ordered BaLnMn2O5 + δ-type (Ln: selected lanthanides) materials is shown for Pr- and Sm-containing compounds. Synthesized by a soft chemistry method, BaPrMn2O5 and BaSmMn2O5 oxides were milled in an appropriately selected conditions, which allowed to obtain samples with largely decreased crystallite size, increased specific surface area, and likely, having a partial Ba-Ln disorder. Such materials were characterized in terms of their oxygen storage-related properties and were found to exhibit enhanced oxygen release kinetics, with a reduction rate parameter being increased several times. The milling process did not influence the mechanism of the oxygen release significantly. A decrease of a characteristic temperature of reduction was also noticed, however, while the oxygen storage capacity of BaSmMn2O5 + δ was found to increase after milling, it decreased for BaPrMn2O5 + δ. It seems that the enhanced reduction rates can be related to a diminished tendency of a formation of the oxygen vacancy-ordered BaLnMn2O5.5. The reported studies are supplemented by scanning electron microscopy and X-ray photoelectron spectroscopy measurements.
AB - A facile, mechanical milling method resulting in a significant improvement of the oxygen release kinetics from cation-ordered BaLnMn2O5 + δ-type (Ln: selected lanthanides) materials is shown for Pr- and Sm-containing compounds. Synthesized by a soft chemistry method, BaPrMn2O5 and BaSmMn2O5 oxides were milled in an appropriately selected conditions, which allowed to obtain samples with largely decreased crystallite size, increased specific surface area, and likely, having a partial Ba-Ln disorder. Such materials were characterized in terms of their oxygen storage-related properties and were found to exhibit enhanced oxygen release kinetics, with a reduction rate parameter being increased several times. The milling process did not influence the mechanism of the oxygen release significantly. A decrease of a characteristic temperature of reduction was also noticed, however, while the oxygen storage capacity of BaSmMn2O5 + δ was found to increase after milling, it decreased for BaPrMn2O5 + δ. It seems that the enhanced reduction rates can be related to a diminished tendency of a formation of the oxygen vacancy-ordered BaLnMn2O5.5. The reported studies are supplemented by scanning electron microscopy and X-ray photoelectron spectroscopy measurements.
KW - Cation-ordered perovskites
KW - Mechanical milling
KW - Oxygen storage
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U2 - 10.1016/j.ssi.2016.11.013
DO - 10.1016/j.ssi.2016.11.013
M3 - Article
AN - SCOPUS:84995912372
SN - 0167-2738
VL - 298
SP - 66
EP - 72
JO - Solid State Ionics
JF - Solid State Ionics
ER -