Department of Inorganic Technology and Environmental Protection, Faculty of Applied Chemistry and Materials Science, University ‘Politehnica’ of Bucharest, Bucharest, Romania 011061 Polizu Street, No. 1–7
National Institute for Material Physics, Bucharest-Magurele, Romania 77125 P.O.Box. Mg-7
Institute of Physical and Chemical ‘Ilie Murgulescu’, Bucharest, Romania Splaiul Independentei Street, No.202
Department of Environmental Engineering, University ‘Constantin Brancusi’, Targu-Jiu, Romania 210152 Genova Street, No. 3
Thermal behaviour of CuS (covellite) obtained from the Cu(CH3COO)2·H2O and Na2S2O3·5H2O
system, working at different molar ratio (1:6 and 1:4) in presence/absence
of NH4VO3, was studied. It was
established that the presence of vanadium in the system induces a densification
of CuS nodules, but do not change the hexagonal CuS structure. It has an important
influence in thermal behaviour of copper sulfide CuS obtained also. The morphological
characteristics of CuS play an important role in the thermal stability and
the stoichiometry of the thermal decompositions.
Also, the possibility
to obtain copper sulfides with greater cooper content was investigated.