Synthesis and characterisation of Li11RE18M4O39−δ: RE = Nd or Sm; M = Al, Co or Fe

CHEN, Yao-Chen, REEVES-MCLAREN, Nik, TAN, Chaou C., BINGHAM, Paul, FORDER, Sue and WEST, Anthony R. (2015). Synthesis and characterisation of Li11RE18M4O39−δ: RE = Nd or Sm; M = Al, Co or Fe. Dalton Transactions, 45 (1), 315-323.

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Official URL: http://pubs.rsc.org/en/content/articlelanding/2016...
Link to published version:: 10.1039/c5dt02998h

Abstract

Four new phases of general formula, Li11RE18M4O39−δ: REM = NdAl, NdCo, SmCo, SmFe, have been synthesised and characterised. The NdAl phase, and probably the others, is isostructural with the NdFe analogue, but some cation disorder and partial site occupancies prevent full structural refinement of powder neutron diffraction data. The NdCo phase also forms a solid solution with variable Li content (and charge compensation by either oxygen vacancies or variable transition metal oxidation state). The NdAl phase is a modest conductor of Li+ ions whereas the other three phases are electronic conductors, attributed to mixed valence of the transition metal ions. Subsolidus phase diagrams for the systems Li2O–Nd2O3– Al2O3, ‘CoO’ have been determined and an additional new phase, LiCoNd4O8, which appears to have a K2NiF4-related superstructure, identified.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number: 10.1039/c5dt02998h
Depositing User: Paul Bingham
Date Deposited: 13 Jan 2016 10:01
Last Modified: 19 Nov 2016 22:27
URI: http://shura.shu.ac.uk/id/eprint/11333

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