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
复制
发表时间:
2016
影响因子:
2.8
通讯作者:
D. Gerthsen
D. Gerthsen
中科院分区:
工程技术4区
文献类型:
--
作者:
M. Meffert;H. Störmer;D. Gerthsen

文献摘要

参考文献

被引文献

相似文献

(Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ(BSCF)是一种很有前途的材料,具有混合的离子和电子导电性,被认为是氧分离膜。材料性质的选择性改善,例如氧扩散率或抑制第二相形成,可以通过B位掺杂来实现。本研究关注在1,000 °C的典型均匀化温度下在未掺杂BSCF中形成Co氧化物沉淀物,其在应用相关温度范围内充当其他第二相的不期望的成核位点。Y掺杂成功地抑制了Co氧化物的形成,而Sc掺杂仅实现了微小的改进。为了理解Y和Sc不同行为的原因,在这项工作中,实验确定了掺杂阳离子在BSCF中的晶格位置。能量色散X射线光谱在透射电子显微镜被施加到定位掺杂剂的网站开发的原子位置通过沟道增强微分析技术。结果表明,Sc只占据B-阳离子网站,而Y被检测到的A-和B-阳离子网站Y掺杂的BSCF,虽然只有B-网站掺杂的目的。提出了一个基于Y双占位抑制掺Y BSCF中Co氧化物形成的模型。
(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.
β-FeSi_2 中位点的电子通道 X 射线微分析
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
β-FeSi2 中位点占据的电子通道 X 射线微量分析
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
氧分离膜用Ba0.5Sr0.5Co0.8Fe0.2O3-δ
DOI: 10.1149/1.3495854
发表时间: 2010
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
DOI: 10.1017/s1431927613013536
发表时间: 2013-10
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