Quasi-elastic neutron scattering study of diffusion in Cu-Se superionic conductor

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dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorLing, CDen_AU
dc.contributor.authorMacquart, RBen_AU
dc.contributor.authorRussina, Men_AU
dc.contributor.authorIzaola, Zen_AU
dc.date.accessioned2021-08-11T22:04:06Zen_AU
dc.date.available2021-08-11T22:04:06Zen_AU
dc.date.issued2009-06-29en_AU
dc.date.statistics2021-08-03en_AU
dc.description.abstractCopper selenide is a mixed ionic-electronic conductor and received attention from the technological and physical point of view in particular due to a high ionic conductivity. According to [1, 2] only a fraction of Cu atoms takes part in the ionic transport in Cu{sub 2-x}Se compounds: the number of mobile atoms is about 1/3 - 1/8 of the total cation concentration in stoichiometric Cu{sub 2}Se and decreases with x causing the ionic conductivity to drop. This conclusion was based on the assumption that Cu mobility does not depend on composition. Therefore the QENS study is of interest because the width and intensity of quasi-elastic peak associated with Cu diffusion are directly related to Cu coefficient of self-diffusion and the number of mobile ions, respectively. This paper presents results of QENS measurements performed on Cu{sub 1.77}Se, Cu{sub 1.90}Se and Cu{sub 1.98}Se compounds at 313 and 430 K. We found that in Cu{sub 1.98}Se the quasielastic component is not observed in ordered non-superionic {alpha}-phase at T = 313 K, however it is clearly seen in superionic {beta}-phase at T=430 K. By contrast the Cu{sub 1.77}Se compound which is superionic at ambient temperature has relatively small quasielastic component showing little difference between 313 and 430 K. The analysis shows that fraction of Cu atoms which takes part in the ionic transport indeed decreases with x in general agreement with papers [1, 2], but not vanishes at x = 0.23. [1] R.A. Yakshibaev et al., Sov. Phys. Solid State, 26 2189 (1984) [2] M.A. Korzhuev, Phys. Solid State 40 217 (1998)en_AU
dc.identifier.citationDanilkin, S. A., Avdeev, M., Ling, C., Macquart, R., Russina, M., & Izaola, Z. (2009). Quasi-elastic neutron scattering study of diffusion in Cu-Se superionic conductor. Presented at ICNX 2009: International Conference on Neutron and X-ray Scattering 2009, Kuala Lumpur, Malaysia, 29 Jun - 1 Jul 2009.en_AU
dc.identifier.conferenceenddate1 July 2009en_AU
dc.identifier.conferencenameICNX 2009: International Conference on Neutron and X-ray Scattering 2009en_AU
dc.identifier.conferenceplaceKuala Lumpur, Malaysiaen_AU
dc.identifier.conferencestartdate29 June 2009en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11332en_AU
dc.language.isoenen_AU
dc.publisherMalaysian Nuclear Agencyen_AU
dc.subjectIonic conductivityen_AU
dc.subjectSelenidesen_AU
dc.subjectCopperen_AU
dc.subjectStoichiometryen_AU
dc.subjectDiffusionen_AU
dc.subjectMobilityen_AU
dc.titleQuasi-elastic neutron scattering study of diffusion in Cu-Se superionic conductoren_AU
dc.typeConference Abstracten_AU
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