Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La6Sr3Si6O24

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

doi:10.1016/j.cclet.2022.05.065

Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La₆Sr₃Si₆O₂₄

Jie Feng
, Lei Zhao
, Wenda Zhang
, Cheng Li
, Congling Yin
, Xiaojun Kuang

Powder Diffraction

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The discovery of new perovskite compounds under high pressure mainly focuses on the ABO₃ compositions and the compositions highly deviated from ABO₃ are less explored. Here we demonstrate that the La₆Sr₃Si₆O₂₄ silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 GPa. The compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic (c′) (La/Sr)O₂ layers and hexagonal (h) (La/Sr)O₃ layers stacked according to (c′hh)₃ sequence. This structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c′-(La/Sr)O₂ layers, resulting in isolated tetrahedral SiO₄ anions and ionic conduction behavior. This work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO₃ under high pressure.

Original language	English
Article number	107551
Journal	Chinese Chemical Letters
Volume	34
Issue number	5
DOIs	https://doi.org/10.1016/j.cclet.2022.05.065
State	Published - May 2023

Funding

The authors thank the National Science Foundation of China (Nos. 21875049 , 22090043 and 22161014 ), Guangxi Natural Science Foundation (Nos. 2019GXNSFGA245006 , AD19245097 and 2020GXNSFAA297220 ), and the Foundation of Guilin University of Technology (No. GUTQDJJ2018115) for the financial support. We thank Prof. Yonggang Wang (Center for High Pressure Science & Technology Advanced Research, Beijing) for proving facility in the thermal analysis.

Keywords

Hexagonal perovskite
High pressure
Ionic conductors
Isolated tetrahedral anion
Silicate

Access to Document

10.1016/j.cclet.2022.05.065

Cite this

@article{89ea7a56d28e45fa9c7734c1bb6e4d40,

title = "Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La6Sr3Si6O24",

abstract = "The discovery of new perovskite compounds under high pressure mainly focuses on the ABO3 compositions and the compositions highly deviated from ABO3 are less explored. Here we demonstrate that the La6Sr3Si6O24 silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 GPa. The compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic (c′) (La/Sr)O2 layers and hexagonal (h) (La/Sr)O3 layers stacked according to (c′hh)3 sequence. This structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c′-(La/Sr)O2 layers, resulting in isolated tetrahedral SiO4 anions and ionic conduction behavior. This work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO3 under high pressure.",

keywords = "Hexagonal perovskite, High pressure, Ionic conductors, Isolated tetrahedral anion, Silicate",

author = "Jie Feng and Lei Zhao and Wenda Zhang and Cheng Li and Congling Yin and Xiaojun Kuang",

note = "Publisher Copyright: {\textcopyright} 2023",

year = "2023",

month = may,

doi = "10.1016/j.cclet.2022.05.065",

language = "English",

volume = "34",

journal = "Chinese Chemical Letters",

issn = "1001-8417",

publisher = "Elsevier",

number = "5",

}

TY - JOUR

T1 - Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La6Sr3Si6O24

AU - Feng, Jie

AU - Zhao, Lei

AU - Zhang, Wenda

AU - Li, Cheng

AU - Yin, Congling

AU - Kuang, Xiaojun

PY - 2023/5

Y1 - 2023/5

N2 - The discovery of new perovskite compounds under high pressure mainly focuses on the ABO3 compositions and the compositions highly deviated from ABO3 are less explored. Here we demonstrate that the La6Sr3Si6O24 silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 GPa. The compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic (c′) (La/Sr)O2 layers and hexagonal (h) (La/Sr)O3 layers stacked according to (c′hh)3 sequence. This structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c′-(La/Sr)O2 layers, resulting in isolated tetrahedral SiO4 anions and ionic conduction behavior. This work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO3 under high pressure.

AB - The discovery of new perovskite compounds under high pressure mainly focuses on the ABO3 compositions and the compositions highly deviated from ABO3 are less explored. Here we demonstrate that the La6Sr3Si6O24 silicate composition can be stabilized as a hexagonal perovskite-related structure with isolated tetrahedra anions under high pressure of 6 GPa. The compound adopts 9-layer shifted hexagonal perovskite-like structure with both B-cation and oxygen deficiencies and contains pseudo-cubic (c′) (La/Sr)O2 layers and hexagonal (h) (La/Sr)O3 layers stacked according to (c′hh)3 sequence. This structure features both B-cation vacancy ordering between the two consecutive hexagonal layers and oxygen vacancy ordering in c′-(La/Sr)O2 layers, resulting in isolated tetrahedral SiO4 anions and ionic conduction behavior. This work demonstrates the practicability of accessing new perovskite-related functional materials from the compositions highly deviated from ABO3 under high pressure.

KW - Hexagonal perovskite

KW - High pressure

KW - Ionic conductors

KW - Isolated tetrahedral anion

KW - Silicate

UR - https://www.scopus.com/pages/publications/85149762627

U2 - 10.1016/j.cclet.2022.05.065

DO - 10.1016/j.cclet.2022.05.065

M3 - Article

AN - SCOPUS:85149762627

SN - 1001-8417

VL - 34

JO - Chinese Chemical Letters

JF - Chinese Chemical Letters

IS - 5

M1 - 107551

ER -