Electrical Conductivity of Ba0.5Sr0.5Co0.8Fe0.2O3-d under Uniaxial Compression at Elevated Temperatures
Electrical Conductivity of Ba0.5Sr0.5Co0.8Fe0.2O3-d under Uniaxial Compression at Elevated Temperatures
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Ba0.5Sr0.5Co0.8Fe0.2O3-d 高温单轴压缩下的电导率
DOI：
10.1149/2.0011411jes
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发表时间：
2014
影响因子：
3.9
通讯作者：
and Jurgen Malzbender
中科院分区：
文献类型：
--
作者：
Wakako Araki;Yu Takemura;Yoshio Arai;and Jurgen Malzbender
本研究报告了Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ（BSCF）在高温压缩载荷下的电导率。在高达1073 K的高温下施加高达110 MPa的压应力。实验结果清楚地表明了BSCF的压阻/导电特性。在压缩加载过程中，电导率增大，而在卸载过程中，电导率减小。电导率与外加应力呈线性相关。在293 K时，电导率随50 MPa应力的平均变化最小（≤ 0.9%），而在473-873 K时，电导率随50 MPa应力的平均变化相对较大（1.2-1.5%）。在1073 K的变化（1-1.2%）也可能与高温蠕变变形。估计的几何效应是相当小的，因此，电导率的增加可能主要归因于与晶格应变相关的压阻/导电效应。计算得到的压阻/导电参数π因子和规范因子分别为15-26× 10 - 11 Pa-1和8-12，比LSCF的高。目前的结果还表明，在高温下使用BSCF作为应力/应变传感器的可能性。
The present study reports on the electrical conductivity of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF) under compressing loadings at elevated temperatures. A compressive stress of up to 110 MPa was applied at elevated temperatures up to 1073 K. The experimental results clearly demonstrate the piezo-resistive/conductive characteristic of BSCF. The conductivity increases during the compressing loading, whilst it decreases during the unloading. The conductivity is linearly correlated to the applied stress. The average variation in the conductivity with 50 MPa of the stress is smallest (∼ 0.9%) at 293 K, whilst it is relatively higher (1.2–1.5%) at 473–873 K. The variation (1–1.2%) at 1073 K could be also related to a high-temperature creep deformation. The estimated geometric effect is quite small; thus, the increase in the conductivity could mostly be attributed to the piezo-resistive/conductive effect related to the lattice strain. The piezo-resistive/conductive parameters, π-factor and gauge factor, calculated are 15–26× 10− 11 Pa− 1 and 8–12, respectively, which are higher than those of LSCF. The present result also indicates a possibility to use BSCF as a stress/strain sensor at elevated temperatures.