Abstract
Quasi-Elastic Neutron Scattering provides a direct way of investigating diffusive mechanisms where the incoherent form is related to tracer diffusion and the coherent form to Fick’s Law diffusion. This paper is concerned with the different information provided by these distinct measurements for the particular case of a lattice gas. The extension of the Chudley-Elliott Model to CQENS from interacting lattice gases is described. The form of QENS for anomalous scattering is also described. These ideas are applied to the case of oxygen diffusion in YBCO at high temperatures where there are some indications of anomalous diffusion associated with the formation of Cu-O chains
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Ross, D.K., Kemali, M., Bull, D.J. (1999). Coherent quasi-elastic neutron scattering from lattice gases and its relationship to fick’s law of diffusion. In: Pękalski, A., Sznajd-Weron, K. (eds) Anomalous Diffusion From Basics to Applications. Lecture Notes in Physics, vol 519. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0106832
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DOI: https://doi.org/10.1007/BFb0106832
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