Vibrational spectra of MIMIII S2 type synthetic minerals (MI=Tl or Ag and MIII=As or Sb)

Influence of silver concentration in Ag (Sb0.33S0.67)100− thin amorphous films on photoinduced crystallization

“…With increasing silver content is visible the decreasing intensity of S-ring fragments vibrations (140 cm À1 and 475 cm À1 ) and the increasing intensity of Sb-Sb bonds vibrations (170 cm À1 ). Shift of band 292 cm À1 to lower frequencies with increasing silver content is also visible which fact is caused by the progress of peak 322 cm À1 correspond with Sb-S vibrations in AgSbS 2 [11]. From these facts preferential coordination between silver and sulfur atoms was assumed.…”

“…Band 170 cm À1 is assigned to Sb-Sb vibrations in S 2 Sb-SbS 2 units and bands 140 cm À1 and 475 cm À1 to vibration of S-rings fragments [10]. Bands 241 cm À1 , 195 cm À1 , 155 cm À1 and 128 cm À1 could be assigned to vibrations of crystalline Sb 2 S 3 [11].…”

“…1. Raman spectra were interpreted [10,11] as follows: broadband 292 cm À1 (thin films) and bands 282 cm À1 and 311 cm À1 (bulk) are assigned [10,11] to vibrations of SbS 3/2 units. Band 170 cm À1 is assigned to Sb-Sb vibrations in S 2 Sb-SbS 2 units and bands 140 cm À1 and 475 cm À1 to vibration of S-rings fragments [10].…”

“…1) are evaluated on basis of [10,11]. From deconvolution and sharpening of the broadband 292 cm À1 to the bands 282 cm À1 and 311 cm À1 is deduced that while films are amorphous, bulk is crystalline.…”

Optically induced crystallization in amorphous Ag (Sb0.33S0.67)100− films

“…3(a) and (b)). Those bands could be assigned to Sb-S stretching and S-Sb-S bending modes according to Minceva [19]. Raman bands sharpening with the increasing of laser exposure time of films was also evidence of the simultaneous crystallization process.…”