The high ionic conducting sodium superionic conductor Na3Zr2Si2PO12 -NaI composites have been prepared successfully via solid state reaction route. As the NaI content increases, the ionic conductivity significantly changes. The composites with 4% NaI show a maximum ionic conductivity of ~ 3 x 10-4 Ω-1cm-1 at 200oC which is one order of magnitude rise as compared to pristine sample. Further crystal structure and surface morphology also reveal the formation of a glassy phase due to the presence of Na-Si-P-O-I interaction.
Unraveling impacts of polycrystalline microstructures on ionic conductivity of ceramic electrolytes by computational homogenization and machine learning
Time-temperature superposition in grain and grain boundary response regime of A2HoRuO6 (A = Ba, Sr, Ca) double perovskite ceramics: A Conductivity Spectroscopic Analysis
在多晶双钙钛矿氧化物A_2HoRuO_6(AHR; A = Ba,Sr,Ca)的交流电导率域中,研究了晶粒和晶界响应的时温叠加原理,寻求一个合适的普适标度因子.随着离子半径的减小,样品显示出从立方到单斜的不同结构相。材料中的变形程度通过键价和(BVS)与键合强度相关。所有样品的电导率谱均服从幂律行为。不同的微观结构特征的导电过程的贡献。直流电阻率的热变化指向从最近邻到可变范围跳变的逐渐交叉。从直流电导率,跳跃频率和弛豫频率得到的激活能显示导电和弛豫机制之间的密切相关性。AHR的比例电导率曲线表明,存在两个不同的导电过程与不同的激活能在晶界和晶粒响应制度。由此得出结论,当材料中同时存在两个不同的热激活区时,单一的标度参数不足以普遍满足时温叠加原理。
AI-Aided Mapping of the Structure-Composition-Conductivity Relationships of Glass-Ceramic Lithium Thiophosphate Electrolytes
具有组成(Li $_2$ S)$_x$(P $_2$ S $_5$)$_{1-x}$的硫代磷酸锂(LPS)是用于固态电池(SSB)的最有前途的电解质材料之一,这是由于它们在室温下的超离子导电性($>10^{-3}$ S cm $^{-1}$)、软机械性能和低晶界电阻。先前已经报道了几种具有不同组成和良好Li导电性的玻璃陶瓷(gc)LPS,但是由于在实验或模拟中表征非晶相的挑战,组成、原子结构、稳定性和Li导电性之间的关系仍然不清楚。在这里,我们映射LPS相图相结合的第一性原理和人工智能(AI)的方法,集成密度泛函理论,人工神经网络的潜力,遗传算法采样,从头算分子动力学模拟。通过一个无监督的结构相似性分析,玻璃/陶瓷相与已知的LPS晶体结构中的局部结构图案,显示出最有利的锂环境随组合物而变化。基于LPS相图中发现的趋势,我们提出了一种候选固态电解质组合物,(Li $_{2}$ S)$_{x}$(P $_{2}$ S $_{5}$)$_{1-x}$($x\sim{}0.725$),其在我们的模拟中表现出高离子电导率($>10^{-2}$ S cm $^{-1}$),从而证明了具有增强的电导率和稳定性的非晶或玻璃态/陶瓷固体电解质的一般设计策略。
Preparation and magnetic properties of (Ln0.2La0.2Nd0.2Sm0.2 Eu0.2)MnO3 (Ln = Dy, Ho, Er) high-entropy perovskite ceramics containing heavy rare earth elements
Processing-Controlled Structural Uniformity and Oxide-Ion Conduction in Na0.52Bi0.47TiO3 Ceramics Probed by Eu3+ Photoluminescence
State Key Laboratory of Integrated Optoelectronics, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, School of Physics, Northeast Normal University(集成光电子学国家重点实验室,教育部紫外发光材料与技术重点实验室,物理学院,东北师范大学)