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Real-space analysis of neutron diffuse scattering from α-AgI

Y Tsuchiya

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Neutron diffuse scattering from alpha -AgI has been analysed in real space. The characteristic feature in g(r)-1 at low r results from the crystalline nature of the average ion density. This suggests that the apparent isotopic effects in S(Q)-1 at low Q observed between NAgI and 109AgI are mainly due to Laue monotonic scattering rather than to interionic correlations. Of most importance is the fact that the Patterson function has to be taken into account to evaluate the correct pair correlation function in the fast-ion conductor. The result for Ag-I is in good agreement with that obtained with EXAFS and confirms that the continuous distribution of Ag ions is excluded from the volume occupied by I ions. A gas-like correlation function is obtained for Ag-Ag pairs.


PACS

66.30.H- Self-diffusion and ionic conduction in nonmetals

61.05.fg Neutron scattering (including small-angle scattering)

Subjects

Condensed matter: structural, mechanical & thermal

Dates

Issue 31 (10 November 1987)



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