Investigation on Oxygen Resistance Properties of RBaCo2O5+δ Ceramics
Source abstract
Abstract
用固相反应法制备了RBaCo 2 O 5+ δ (R=Y、Dy、Gd、Pr、Nd、Sm和Eu)系列陶瓷. 用标准四探针法测量了它们从室温到600℃之间的电阻率变化. 在温度较低时, 它们的电阻率都随着温度的升高而减小, 显示为半导体特征. 当电阻率在某一温度达到最大值后, 电阻率开始随着温度升高而缓慢增加, 显示为半金属特征. 进一步研究了RBaCo 2 O 5+ δ 系列陶瓷在高温恒温时的电阻率随着环境气氛的变化情况. 结果表明RBaCo 2 O 5+ δ 陶瓷是一类潜在的氧阻传感器材料, 并且它们的响应速率从快到慢顺序是YBaCo 2 O 5+ δ > DyBaCo 2 O 5+ δ > GdBaCo 2 O 5+ δ > PrBaCo 2 O 5+ δ > NdBaCo 2 O 5+ δ > SmBaCo 2 O 5+ δ > EuBaCo 2 O 5+ δ . 以YBaCo 2 O 5+ δ 陶瓷为例, 在700℃恒温时, 当从氧气氛切换到氮气氛时, 由于晶格中氧的脱附导致电阻率先是快速上升, 然后缓慢上升, 并在90 s内达到最大平衡值. 反之, 当从氮气氛切换为氧气氛时, 由于氧的吸附, 电阻率迅速降低, 约30 s内达到最小平衡值.
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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
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