Structure,microstructureandionicconductivityofthesolidsolution LiTi2 xSnx(PO4)3
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Université akli mohand oulhadj Bouira
Abstract
The NasiconcompoundswiththecompositionLiTi2 xSnx(PO4)3 (x¼0–1.8) weresynthesisedbythe
solid statereaction.TheirstructuresweredeterminedfromX-raypowderdiffractionusingRietveld
analysis.AllthecompositionspresentthespacegroupR-3c.TherefinementsshowthattheTiandSn
cations arestatisticallydistributedoverthesamepositionwhiletheLionesareexclusivelylocatedon
the M1site.Thelatticeconstants a and c exhibit linearvariationoverthewholecompositionrange.The
bond lengthsareinaccordancewiththoseofotherNasiconstructures.TheSEMmicrographsofthe
samplesshowrelativeporousmicrostructures.Theionicconductivityisabout10 4–10 5 S cm 1; for
the activationenergy,atypicalvalueof0.32eVisobtainedfor x¼0.6 compositionwhereassignificant
deviationfromlinearityinthetemperaturedependenceofthedcconductivity,isobservedfortheSn-
rich ones.Thistendencyisdiscussedalongwiththestructuralfeatures
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Elsevier