Antimony chalcogenides

Thio- and selenohalides MEX3 (E = S, Se) are accessible by the reaction of antimony chalcogenides with pentahalides at rt in CS2. NbSCls can also be conveniently obtained by reacting the pentachloride with hexamethyldisilathiane... 

Li the case of Sb2S3 and NaCl, the energy difference is AU = - 8 kcal and, therefore, the conditions for the synthesis of NaSbS2 are unfavorable. This was confirmed by e q >eriments which demonstrated that the direction of the reaction was predominantly from the right to the left so that sodium thioantlmonide was not obtained. We calculated the values of AU for all cases of interaction between alkali halides and antimony chalcogenides. Figure 1 shows the dependences of AU on the radius of the alkali metal ion r. 

Arsenic, Antimony and Bismuth Table 13.10 Some properties of Group 15 chalcogenides M2X3... 

Although arsenic is a nonmetal, the chalcogenide halides of this element bear a strong relationship to the antimony and bismuth systems, and will therefore be treated separately. 

Chalcogenide halides of antimony and bismuth have been known since the end of the last century, mainly through contributions by Ouvrard and Schneider. With the exception of BiSeCl, only thiohalides were reported. The early work is summarized in (147) (Sb, before 1948) and (148) (Bi, before 1927), and it will only occasionally be dealt with. Beyond that, these materials had not found much interest. 

In the early 1950s, in a systematic study, Donges (106-108) discovered most of the chalcogenide halides of antimony and bismuth that are known today, and then solved their structures. 

The chalcogenide halides of antimony and bismuth are stable in air, and do not dissolve in H O or diluted acids. Their colors, mainly referring to single-crystal needles, are given in Tables XXIII and XXIV. 

Some Physical Properties of Antimony and Bismuth Chalcogenide Halides... 

The binary chalcogenides of antimony and bismuth are highly colored compounds that are readily prepared by direct reaction of the elements at 500-900 C. They have rather complex ribbon or layer structures and exhibit semiconductor properties. 

Gallium(III) azide, 72 360 Gallium-based laser diodes, 72 349 Gallium chalcogenides, 72 359 Gallium compounds, 72 344, 355-361 with ammonia, 72 357-358 with phosphorus, arsenic, and antimony, 72 360... 

This section contains a review of results on the extensive study of defect states in the mobility gap of amorphous As- and Sb-containing chalcogenide semiconductors by relaxation technique. For extracting typical features, elemental selenium and simple compositions with relatively low content of arsenic and antimony are exemplified as possible. We will try to attribute TSDC peaks to charge carriers released from the respective trapping levels in the band gap of these materials. 

The 8-N rule states that the number of bonds (or local coordination, x) equals 8 minus the number of the periodic group. This rule is illustrated in Fig. 1.2 where we see that for N — 7 the halogens take dimeric structure types with x = 1, for N = 6 the chalcogenides selenium and tellurium take helical chain structures with x = 2, for N = 5 the pnictides arsenic, antimony, and bismuth take a puckered layer structure with x = 3, and for N = 4 the semiconductors... 

CHALCOGENIDE HALIDES OF COPPER, GOLD, MERCURY, ANTIMONY, AND BISMUTH... 

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