Effects of oxygen defects on structure and properties of Sm0.5Sr0.5CoO3-δ annealed in different atmospheres

Samples of Sm0.5Sr0.5CoO3–δ were annealed in different atmospheres（Ar,N2,and O2） and temperatures（400 1200 oC）,and changes in their masses,structures,surface transport properties,optical properties,and oxygen nonstoichiometries were investigated using thermogravimetric（TG） analyses,X-ray diffraction...

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Published inJournal of rare earths Vol. 31; no. 12; pp. 1183 - 1190
Main Author 陆依 陈乐 陆春华 倪亚茹 许仲梓
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2013
Subjects
Annealing
Atmospheres
conductivity
optical properties
oxygen vacancies
Rare earth metals
rare earths
reflectance
Spectra
Temperature
X-ray diffraction
X-ray photoelectron spectroscopy
X-rays
XPS
X射线衍射分析
光电子能谱法
性能
氧缺陷
氮气气氛
结构
表面电导率
退火
optical properties
XPS
conductivity
reflectance
oxygen vacancies
rare earths
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Summary:Samples of Sm0.5Sr0.5CoO3–δ were annealed in different atmospheres（Ar,N2,and O2） and temperatures（400 1200 oC）,and changes in their masses,structures,surface transport properties,optical properties,and oxygen nonstoichiometries were investigated using thermogravimetric（TG） analyses,X-ray diffraction（XRD） analyses,electrical conductivity measurements,reflection spectra measurements,and X-ray photoelectron spectroscopy,respectively.The TG analyses,performed in air and an N2 atmosphere,allowed us to determine the changes in the masses of the samples.The results of the XRD analyses elucidated the changes in the structure of the samples under different conditions.The XPS spectra and simulation data indicated that the number of oxygen defects generated in the samples depended on the temperature and atmosphere.At high temperatures,the surface conductivities and full-spectrum reflectivities of the samples decreased with an increase in the number of oxygen vacancies.In an oxidative atmosphere,the samples exhibited outstanding visible and near-infrared light absorption.Furthermore,the samples were highly sensitive to a reducing atmosphere at various temperatures.On the basis of the fact that the properties of Sm0.5Sr0.5CoO3–δ vary with the environment,it has potential use in high-temperature applications such as weather sensors.
Bibliography:11-2788/TF
conductivity; optical properties; reflectance; XPS; oxygen vacancies; rare earths
Samples of Sm0.5Sr0.5CoO3–δ were annealed in different atmospheres（Ar,N2,and O2） and temperatures（400 1200 oC）,and changes in their masses,structures,surface transport properties,optical properties,and oxygen nonstoichiometries were investigated using thermogravimetric（TG） analyses,X-ray diffraction（XRD） analyses,electrical conductivity measurements,reflection spectra measurements,and X-ray photoelectron spectroscopy,respectively.The TG analyses,performed in air and an N2 atmosphere,allowed us to determine the changes in the masses of the samples.The results of the XRD analyses elucidated the changes in the structure of the samples under different conditions.The XPS spectra and simulation data indicated that the number of oxygen defects generated in the samples depended on the temperature and atmosphere.At high temperatures,the surface conductivities and full-spectrum reflectivities of the samples decreased with an increase in the number of oxygen vacancies.In an oxidative atmosphere,the samples exhibited outstanding visible and near-infrared light absorption.Furthermore,the samples were highly sensitive to a reducing atmosphere at various temperatures.On the basis of the fact that the properties of Sm0.5Sr0.5CoO3–δ vary with the environment,it has potential use in high-temperature applications such as weather sensors.
LU Yi;CHEN Le;LU Chunhua;NI Yaru;XU Zhongzi;State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60424-4