Trirutile lattice

Vj Fig 14.17 The unit cell of FeSb20g which has a trirutile lattice compare with the rutile unit cell in Figure 5.21. Colour code Sb, yellow Fe, green O, red the edges of the unit cell are defined in yellow. 

The rutile and trirutile compounds of table 8 are characterised by a missing cation order and a cation order which is not vertical to oxygen layers, respectively. 77-bonding may be effective in these lattice types, however (3). As was stated at the end of section F, zJ-effects opposite to those observed for a cation order vertical to oxygen layers are expected in these cases. Indeed the substitution of a d - by a d -cation of high oxidation state is accompanied by a distinct decrease in J, which is larger for the ordered than for the disordered phases (Table 8). 

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