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    STUDIA GEOLOGIA - Issue no. 3 / 2003  
         
  Article:   CUBIC COTE2: SYNTHESIS, STRUCTURE DETERMINATION AND REFLECTED LIGHT INVESTIGATIONS.

Authors:  FRANZ PERTLIK.
 
       
         
  Abstract:  Single crystals of CoTe2 were synthesized under hydrothermal conditions at 250oC in concentrated aqueous NaOH solution from the elements cobalt and tellurium. The crystal structure is a representative of structure type “pyrite”, proved by single crystal X-ray work. The reflectance spectra of CoTe2 were measured with polarized light within the range from 400 to 800 nm, in air and in oil. The comparison of these data with that of the isotypic compounds CoSe2 (trogtalite) and CoS2 (cattierite) shows an increase of the reflectance values correlated with the atomic number of the chalcogen atom. The colours change from light cream-brown (CoS2) to light pink-brown (CoSe2) to white (CoTe2) and depend on a shift of the reflectance minimum from ~ 520 nm (CoS2) to ~ 630 nm (CoTe2).  
         
     
         
         
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