Li Wei, Wu Xiaoyu, Huang Ziheng, Wang Depeng, Wang Weitian
School of Physics and Electronic Information, Yantai University, Yantai 264005, China.
Materials (Basel). 2024 Dec 23;17(24):6286. doi: 10.3390/ma17246286.
In this study, we synthesized perovskite BaSrSnO ceramics with a unique thorn-like microstructure using the solid-state reaction method. The structural and complex dielectric properties were investigated in detail. X-ray diffraction was employed to characterize the phase purity, while X-ray photoelectron spectroscopy was used to analyze the chemical state of the components. The frequency and temperature dependence of the dielectric properties indicates that both the dielectric constant and loss are influenced by A-site ion doping as well as the presence of the thorn-like microstructure. The observed dielectric behavior can be explained by the interfacial polarization and dielectric relaxation processes, which arise from the existing Sn-Sn pairs, oxygen vacancies, and defects with activation energies of 0.38 eV, 0.73 eV, and 0.54 eV, respectively. The resistances of grain boundaries, grains, and the thorn-like structure were revealed by the impedance spectra. These findings provide valuable insights into understanding structure-property relationships in perovskite stannate ceramics.
在本研究中，我们采用固态反应法合成了具有独特刺状微观结构的钙钛矿BaSrSnO陶瓷。详细研究了其结构和复介电性能。采用X射线衍射表征相纯度，同时利用X射线光电子能谱分析各组分的化学状态。介电性能的频率和温度依赖性表明，介电常数和损耗均受A位离子掺杂以及刺状微观结构的影响。观察到的介电行为可以用界面极化和介电弛豫过程来解释，这些过程分别由存在的Sn-Sn对、氧空位和缺陷引起，其激活能分别为0.38 eV、0.73 eV和0.54 eV。阻抗谱揭示了晶界、晶粒和刺状结构的电阻。这些发现为理解钙钛矿锡酸盐陶瓷的结构-性能关系提供了有价值的见解。
