The dynamics of phase transitions and symmetry changes with laser heating in ZnO(Co) nanoparticles

In this study, we investigated the effects of laser-induced heating on ZnO samples with varying CoO dopant concentrations, prepared using the traditional calcination method at 600 °C. The relationship between peak intensity, phase, and symmetry changes during laser heating and its relation to dopant concentration was explored. Our results revealed phase transitions during the additional heating process, highlighting that such transitions can occur even when symmetry remains unchanged. The key dopant concentrations at which phase transitions are most evident were found to be 30 % CoO and 70 % CoO. This study provides insights into the complex behavior of CoO doped ZnO under laser-induced heating and contributes to understanding phase transition mechanisms in these materials.