Abstract
As was explained in our previous paper [1] we have derived our model for the diffusive motion of silver ions by starting from qualitative features observed in the neutron spectra of α-AgI. We know from experience that in the here considered Q-range simple monatomic liquids give relatively simple Lorentzian-type quasielastic peaks [2]. These are closely related to translational diffusion. Plastic crystals on the other hand yield quasielastic spectra plus a purely elastic contribution [3], because there is a local diffusive motion within a limited volume (see Fig. 5 in ref. [1]). We have therefore chosen a model which allows for both types of effects. Aperfect fit to our data has been obtained with the parameter values given in Table 1 for 250°C.
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References
K. Funke, G. Eckold and R.E. Lechner in Proceedings of the Summer School on “Microscopic Structure and Dynamics of Molecular Liquids”, Aleria, 28/8–10/9 1977, Ed. J. Dupuy (1978).
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In fact no more than eleven (powder) reflections have been reported from a-AgI near the a-ß transition, and at higher temperatures the number of measurable Bragg peaks was even smaller (9 at 255°C and 6 at 450°C) [7].
J. Goulon (L.U.R.E. - Orsay), private communication.
G. Eckold, K. Funke, J. Kalus and R.E. Lechner, J. Phys. Chem. Solids 37, 1097 (1976).
Contrary to what is said in [9] we have never claimed that the [100]-directions are “channels of the cation diffusion”. This was considered as one of the possibilities together with the approximation of isotropic jump diffusion,and it was clearly stated that the two versions of the jump diffusion model could not be distinguished experimentally [12]. It should also be mentioned that the hops between neighbouring tetrahedral sites proposed in [8] occur on a time scale which is covered by our “local random motion”. A comparison of the corresponding residence-to-flight-time ratio with the ratio we obtained for the translational “jump” diffusion (which is an order of magnitude slower than the local random motion) is therefore meaningless.
W.H. Flygare and R.A. Huggins, J. Phys. Chem. Solids 34, 1199 (1973).
W. Schommers, Phys. Rev. Letters 38, 1536 (1977).
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© 1978 Plenum Press, New York
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Lechner, R.E., Eckold, G., Funke, K. (1978). Single Particle and Collective Aspects of the Silver Ion Motion in α-AgI. In: Dupuy, J., Dianoux, A.J. (eds) Microscopic Structure and Dynamics of Liquids. NATO Advanced Study Institutes Series, vol 33. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-0859-1_15
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