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By Neuert H.

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In applying this model to the wurtzite phase, an additional constraint was added, namely, that the ions do not occupy the octahedral sites. This is undoubtedly a valid assumption due to the small conductivity and low disorder in this phase. 13). a, a. 1. Also included is r face ' that value of rexcluded which corresponds to the allowed volume just touching the face of the tetrahedral cage. The obtained values of rexcluded are such that only the trigonal and tetrahedral locations are occupied in the superionic phase.

Data were collected in all three phases from 77 K to 470°C. The experimental arrangement and the data reduction were the same as that for AgI. 13 for the y-phase data at low (77 K) and high (200°C) temperatures and for the superionic a-phase data at 470°C. 7 a-I, was used for the Fourier transform to real space. 13a) is due to the four iodine first neighbors to the Cu in the zincb1ende lattice. 5 Rare due to more distant neighbors. 61 ° A. Using this ~Cu-I the unknown near-neighbor PCu-I(r) at elevated temperatures was obtained.

This section is the first of two sections, divided according to the structure of the immobile-ion lattice. This concerns the bcc materials represented by AgI. The next treats the fcc materials represented by CuI. The nature of the conduction path in these two structures is different. In the bcc structure, the largest voids are tetrahedra which share faces with one another. So the Ag ions can move among equivalent sites by passing through the tetrahedral faces. The fcc structure contains tetrahedra which share corners with one another and which share faces with octahedra and not with other tetrahedra.

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