Intrachain distance

Table 6 Cu---Cu intrachain distances (A) in halide mediated 1-D chains... 

The host lattice CeMgAlnO 7 has the magnctoplumbite structure, LaP04 the mon-azite stnicture, and GdMgBsOio a structure consisting of a two-dimensional framework of BO3 and BO4 groups in which the Mg ions ate in octahedral coordination and Gd in ten coordination [19]. The Gd polyhedra form isolated zig-zag chains. The shortest Gd-Gd intrachain distance is about 4 A, the shortest Gd-Gd interchain distance 6.4 A. 

For simplicity the function VFij (R) is referred to below as the distribution of intrachain distance R. We consider the following three cases ... 

These values for case I are very close to the above-mentioned theoretical ones for v = 0.588 (s = 2.29, t = 2.43). The t values for the three cases are nearly coincident and close to 2.50 which can be obtained from Fisher s relation (eq. 1.40) and Flory s i/ value of 0.6. On the other hand, the s values indicate a significant dependence on the location of the central chain, being larger for the central chain situated in a more internal part of the entire chain. Summarizing, we see that the distribution of intrachain distance R is described by the same form as the Mazur function but varies with the location of the central chain approximately through the position-dependent parameter s. 

Mean Square and Mean Reciprocal of Intrachain Distance... 

By calculating the total niunber of trapping events it can be seen that the typical distance which a charge carrier travels between two trapping events is of the order of 4 A. This value is comparable to the intrachain distance and indicates that the transport in these materials can be best described by conventional hopping between closely neighbouring sites. No evidence for bandlike transport has been foimd. 

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