SUBSOLIDUS PHASE-EQUILIBRIUM IN THE CU-SB-O SYSTEM

The study of the subsolidus phase equilibrium in Cu-Sb-O system was st arted using samples with compositions laying, at room temperature, in the CuO-Sb2O3 subsystem. Isothermal and non-isothermal experiments wer e performed to analyze the system in the 500-1000 degrees C range. At high temperatures (over 500 degrees C) the system transforms in a quat ernary one: CuO-Cu2O-Sb2O3-Sb2O5 as Sb2O3 undergoes oxidation to Sb2O4 and Sb2O5 and CuO reduces to Cu2O. The formation of the CuSb2O6 and C u4SbO4.5 binary compounds is reported. The calculations of mass variat ion and atomic composition modifications lead to a quaternary oxide re presentation of the subsolidus phase equilibrium.