期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 27, 期 9, 页码 2387-2394出版社
SPRINGER
DOI: 10.1007/s10008-023-05523-9
关键词
Dielectric; Morphology; Ionic conductivity; Doping; Impedance
We investigated the influence of indium doping on the thermal stability and ionic conductivity of beta alumina NaInxAl11-xO17 solid electrolyte. The samples were synthesized by sol-gel autocombustion method with varying dopant concentration. XRD and FESEM analyses showed changes in unit cell volume and morphology with increasing dopant concentration. The thermal stability of beta-alumina improved significantly even at low dopant concentrations. EIS measurements indicated a considerable reduction in frequency-dependent dielectric permittivity for doped beta alumina.
We report the effect of indium doping on thermal stability and ionic conductivity of beta alumina NaInxAl11-xO17 solid electrolyte which is synthesized by sol-gel auto combustion method on varying dopant concentration as x = 0, 0.1, 0.2, 0.3, and 0.4. X-ray diffraction (XRD) pattern and microstructure are investigated on the doped samples calcined at 1100 degrees C for 5 h. XRD confirms the change in unit cell volume on increasing the dopant concentration. Field emission scanning microscope (FESEM) reveals the conversion of cylindrical morphology to small spherical particles at dopant concentration x >= 0.5. Thermal stability is found to improve drastically over a broad temperature range even at small dopant concentrations in beta-alumina as found from thermo-gravimetric analysis (TGA). Electrochemical impedance spectroscopy (EIS) shows a considerable reduction in frequency-dependent dielectric permittivity for doped beta alumina. At frequency 1 kHz, the permittivity of around similar to 10(5) in as-prepared shows non-monotonous dependence and decreases to 10(3) for x >= 0.1. This steep variation is mainly attributed to the change in morphology caused by steric effect and formation of random clusters which reduces the net polarization.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据