材料科学
兴奋剂
晶体结构
电导率
介电谱
烧结
氧化物
钙钛矿(结构)
化学工程
微观结构
电阻率和电导率
热力学
结晶学
物理化学
电化学
复合材料
冶金
光电子学
电极
工程类
物理
电气工程
化学
作者
Jiadong Hou,Yufeng Liu,Chufei Cheng,Fuhao Cheng,Teng Su,Chao Ma,Yang Miao,Xiaomin Wang
标识
DOI:10.1016/j.ceramint.2023.09.042
摘要
High entropy materials offer optimal conditions for regulating and modifying new material properties due to their vast composition space. Through traditional solid phase sintering, this article successfully synthesized a series of Sr(Ti0.2Zr0.2Y0.2Sn0.2Hf0.2Sc0.2x)O3-σ high entropy perovskite oxides with varying Sc3+ doping concentrations and comprehensively investigated the microstructure morphology, crystal structure, and electrical conductivity of Sc-doped HEPs as well as their influence on oxygen transfer rate. The results demonstrate the successful incorporation of Sc3+ into the high entropy lattice, resulting in a transformation of the crystal to a positively cubic structure with enhanced reciprocity. While the lattice vibration of BO6 octahedron is weakened by the introduction of Sc3+, it has no impact on the phase stability of the crystal structure. Moreover, The results of the electrochemical impedance spectroscopy test demonstrate that at a temperature of 750 °C, with a doping amount of Sc3+ at 0.14, the conductivity (σ) of Sc3+ is measured to be 5.74 × 10−3 S/cm, exhibiting an increase of 61.7% compared to non-doped samples. Correspondingly, the activation energy (Ea) is reduced from 0.51 eV to 0.39 eV as well. This doping strategy effectively expands the potential applications of high entropy perovskite oxides in solid oxide fuel cells (SOFCs). These findings serve as a driving force for further investigation into high entropy ceramics of the strontium series that exhibit optimal properties.
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