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Issue 23, 2015
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Reductive lithium insertion into B-cation deficient niobium perovskite oxides

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Abstract

Reaction between LiH and the AnBn−1O3n cation deficient perovskite phases Ba5Nb4O15, Ba6TiNb4O18 and Ba3LaNb3O12 proceeds by reductive lithium insertion, leading to the formation of Ba5LiNb4O15, Ba6LiTiNb4O18 and Ba3LaLiNb3O12 respectively. During lithium insertion into Ba5Nb4O15 and Ba6TiNb4O18 the respective ccchh and cccchh stacking sequences are converted into entirely cubic stacking sequences, while the B-cation vacancy order of the two phases is faithfully converted into Li–Nb or Li–Nb/Ti cation order in the lithiated products. In contrast lithium insertion into Ba3LaNb3O12 leads to no gross change in structure, with the inserted lithium cations displacing some of the niobium cations leading to a cation disordered material. Transport measurements indicate semiconducting behaviour consistent with variable range hopping for Ba5LiNb4O15 and insulating behaviour for Ba6LiTiNb4O18 and Ba3LaLiNb3O12. Detailed analysis of the crystal structure of Ba6LiTiNb4O18 suggests crystallographic charge ordering in this phase.

Graphical abstract: Reductive lithium insertion into B-cation deficient niobium perovskite oxides

  • This article is part of the themed collection: Perovskites
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Supplementary files

Article information


Submitted
16 Oct 2014
Accepted
16 Dec 2014
First published
17 Dec 2014

Dalton Trans., 2015,44, 10636-10643
Article type
Paper
Author version available

Reductive lithium insertion into B-cation deficient niobium perovskite oxides

A. Perejon and M. A. Hayward, Dalton Trans., 2015, 44, 10636
DOI: 10.1039/C4DT03193H

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