Figure 18
Bond-valence sums of the constituting ions in selected TlI rare-earth sulfides. (Hypothetical structures are considered to be cubic of the disordered NaCl type with the same unit-cell volume as the corresponding ones of the α-NaFeO2 structural type.) The structures are referenced in Table S18
. TlD and Tl Kabré represent the determinations by Duczmal & Pawlak (1994) and Kabré et al. (1974). |