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Muon spin relaxation study of phosphosilicate gels
Ist Teil von
Solid state ionics, 2020-05, Vol.348, p.115287, Article 115287
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Muon dynamics in phosphosilicate proton conductors P2O5-SiO2 with a composition 30 mol% phosphorus oxide (30P) have been studied as a function of temperature using muon spin relaxation. For materials heat treated at 300 °C the muons implant at sites close to P-OH groups associated with water molecules. While in 1000 °C heat treated samples the muons are trapped at sites involving a bridging oxygen P-O-Si. Averaging of the local nuclear dipolar field by dynamics of the adsorbed water is observed above ca 180 K for the muon sites in the 300 °C heat treated sample. There is some evidence for further muon dynamics in this material above 250 K perhaps caused by muon diffusion.
•Muons used as an extrinsic probe of the proton conductivity in phosphosilicate gels•Sensitive to the dynamics of the muon and water present with increasing temperature•Some evidence for non-local diffusion but dominated by the water reorientation•Muons less useful as probe in water containing systems