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.
Muon spin relaxation study of phosphosilicate gels / Esposito, S.; Clayden, N. J.; Cottrell, S. P.. - In: SOLID STATE IONICS. - ISSN 0167-2738. - 348:(2020), p. 115287. [10.1016/j.ssi.2020.115287]
Muon spin relaxation study of phosphosilicate gels
Esposito S.;
2020
Abstract
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.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2804694