Dopant-Site Determination in Y- and Sc-Doped (Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ by Atom Location by Channeling Enhanced Microanalysis and the Role of Dopant Site on Secondary Phase Formation
Dopant-Site Determination in Y- and Sc-Doped (Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ by Atom Location by Channeling Enhanced Microanalysis and the Role of Dopant Site on Secondary Phase Formation
复制标题
通过通道增强微量分析的原子位置测定 Y 和 Sc 掺杂 (Ba0 5Sr0 5)(Co0 8Fe0 2)O3âδ 中的掺杂位点以及掺杂位点对二次相形成的作用
DOI:
10.1017/s1431927615015536
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发表时间:
2016
影响因子:
2.8
通讯作者:
D. Gerthsen
中科院分区:
文献类型:
--
作者:
M. Meffert;H. Störmer;D. Gerthsen
(Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ(BSCF) is a promising material with mixed ionic and electronic conductivity which is considered for oxygen separation membranes. Selective improvement of material properties, e.g. oxygen diffusivity or suppression of secondary phase formation, can be achieved by B-site doping. This study is concerned with the formation of Co-oxide precipitates in undoped BSCF at typical homogenization temperatures of 1,000°C, which act as undesirable nucleation sites for other secondary phases in the application-relevant temperature range. Y-doping successfully suppresses Co-oxide formation, whereas only minor improvements are achieved by Sc-doping. To understand the reason for the different behavior of Y and Sc, the lattice sites of dopant cations in BSCF were experimentally determined in this work. Energy-dispersive X-ray spectroscopy in a transmission electron microscope was applied to locate dopant sites exploiting the atom location by channeling enhanced microanalysis technique. It is shown that Sc exclusively occupies B-cation sites, whereas Y is detected on A- and B-cation sites in Y-doped BSCF, although solely B-site doping was intended. A model is presented for the suppression of Co-oxide formation in Y-doped BSCF based on Y double-site occupancy.
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DOI:
--
发表时间:
2003
期刊:
HRTEM Reports, CIA, Nagasaki University 6
影响因子:
--
作者:
T.Morimura
通讯作者:
T.Morimura
DOI:
--
发表时间:
2003
期刊:
HRTEM Reports, CIA, Nagasaki University 6
影响因子:
--
作者:
T.Morimura;M.Hasaka
通讯作者:
M.Hasaka
影响因子:
8.6
作者:
P. Müller;L. Dieterle;E. Müller;H. Störmer;D. Gerthsen;C. Niedrig;Simon Taufall;S. Wagner;E. Ivers
通讯作者:
E. Ivers
影响因子:
2.8
作者:
P. Müller;M. Meffert;H. Störmer;D. Gerthsen
通讯作者:
P. Müller;M. Meffert;H. Störmer;D. Gerthsen
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
M. Oxley;L. Allen
通讯作者:
L. Allen