Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La_(6)Sr_(3)Si_(6)O_(24)

作     者：Jie Feng Lei Zhao Wenda Zhang Cheng Li Congling Yin Xiaojun Kuang Jie Feng;Lei Zhao;Wenda Zhang;Cheng Li;Congling Yin;Xiaojun Kuang

作者机构：Guangxi Key Laboratory of Optic and Electronic Materials and DevicesMOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China Neutron Scattering DivisionOka Ridge National LaboratoryOak Ridge 37831United States Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional MaterialsCollege of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第5期

页      面：548-552页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the National Science Foundation of China(Nos.21875049,22090043 and 22161014) Guangxi Natural Science Foundation(Nos.2019GXNSFGA245006,AD19245097 and 2020GXNSFAA297220) the Foundation of Guilin University of Technology(No.GUTQDJJ2018115)for the financial support 

主　　题：High pressure Hexagonal perovskite Isolated tetrahedral anion Silicate Ionic conductors 

摘      要：The discovery of new perovskite compounds under high pressure mainly focuses on the ABO_(3)compositions and the compositions highly deviated from ABO_(3)are less *** we demonstrate that the La_(6)Sr_(3)Si_(6)O_(24)silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 *** compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic(c)(La/Sr)O_(2)layers and hexagonal(h)(La/Sr)O_(3)layers stacked according to(c hh)_(3)*** structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c-(La/Sr)O_(2)layers,resulting in isolated tetrahedral Si O_(4)anions and ionic conduction *** work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO_(3)under high pressure.