Investigating the presence of an order-disorder transition in La6Y4Ge6O27

DOI

Apatite-type phases have been attracting interest as a new class of oxide ion conductors, and in these systems, the key defects are oxide ion interstitials. We have recently been investigating Y doping in La9.33+xGe6O26+3x/2 and have shown that up to 30% Y incorporation helps stabilise the hexagonal lattice. However, for higher Y levels, i.e. La6Y4Ge6O27, a triclinic cell is obtained. Such samples also show a significantly lower conductivity at low temperatures. However, at temperatures >750C, a significant enhancement in conductivity is seen typical of an oxygen order-disorder transition. To our knowledge this is the first example of such a transition in an interstitial oxide ion conductor, and the aim of this experiment is to investigate its' nature.

Identifier
DOI https://doi.org/10.5286/ISIS.E.24032520
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24032520
Provenance
Creator Dr Peter Slater
Publisher ISIS Neutron and Muon Source
Publication Year 2011
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2008-09-19T08:47:48Z
Temporal Coverage End 2008-09-20T05:40:51Z