1. INFLUENCE OF THE THERMAL TREATMENT ON THE COLOUR OF RO٠AL2O3 (R=CO, NI) TYPE SPINEL PIGMENTS PREPARED BY A MODIFIED SOL – GEL METHOD. Authors: ANDREEA ANTON, GHEORGHE BORODI, GABRIEL KATONA, THOMAS DIPPONG, ALEXANDRA AVRAM, LILIANA BIZO, ROXANA DUDRIC, FIRUTA GOGA.2. SYNTHESIS OF COBALT FERRITE NANOPARTICLES VIA A SOL-GEL COMBUSTION METHOD . Authors: ALEXANDRA AVRAM, ROXANA DUDRIC, BOGDAN STEFAN VASILE, MIRCEA NASUI, AMALIA MESAROȘ, FIRUTA GOGA, RAREȘ-ADRIAN BORTNIC.3. INFLUENCE OF THE Ni/Mg RATIO ON THE COLOUR OF SPINEL PIGMENTS PREPARED BY A MODIFIED SOL – GEL METHOD . Authors: THOMAS DIPPONG, CSABA VARHELYI JR., ALEXANDRU HORATIU MARINCAS, ALEXANDRA AVRAM, LILIANA BIZO, ROXANA DUDRIC, FIRUTA GOGA.