Transformation of a layered perovskite to a defect perovskite via cooperative Li-insertion and O/N substitution

Title
Transformation of a layered perovskite to a defect perovskite via cooperative Li-insertion and O/N substitution
Author(s)
김영일김정미박치성[박치성]박철희[박철희]
Keywords
ION CONDUCTORS; CRYSTAL-STRUCTURE; TEMPERATURE SYNTHESIS; NEUTRON-DIFFRACTION; OPTICAL-PROPERTIES; METAL NITRIDES; OXYNITRIDES; OXIDE; INTERCALATION; LI2LATA2O6N
Issue Date
201411
Publisher
ROYAL SOC CHEMISTRY
Citation
DALTON TRANSACTIONS, v.43, no.44, pp.16830 - 16837
Abstract
Defect perovskite oxynitrides containing lithium on the octahedral sites, i.e., Sr1-x(LixTa1-x)(O3.5-3x-3yN2y), were produced by the ammonolytic heating of a layered perovskite, Sr2Ta2O7, with Li2CO3. The above phase evolution involved the thermal diffusion of Li+ into the Sr2Ta2O7 lattice and concurrent 3O(2-) -> 2N(3-) substitution. The concentrations of Li, N, and anion vacancies in the product oxynitride could be controlled by adjusting the Li2CO3 to Sr2Ta2O7 ratio in the reactant mixture. This study identified three different compositions, Sr0.92Li0.08Ta0.92O1.91N0.89, Sr0.83Li0.17Ta0.83O1.88N0.74 and Sr0.73Li0.27Ta0.73O1.82N0.58, where an increase in the Li composition accompanied decreases in the a-and c-parameters of the tetragonal cell, along with an increase in the band gap. Neutron diffraction and solid state Li-7 nuclear magnetic resonance spectroscopy of Sr1-x(LixTa1-x)(O3.5-3x-3yN2y) showed that Li occupied the octahedral site, and these oxynitrides exhibited enhanced bond covalency compared to similar oxides.
URI
http://hdl.handle.net/YU.REPOSITORY/30455http://dx.doi.org/10.1039/c4dt02335h
ISSN
1477-9226
Appears in Collections:
이과대학 > 화학생화학부 > Articles
문과대학 > 중국언어문화학과 > Articles
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