Low-cost thermo-chemical process of TiO2 powder purification: study of iterative gettering effectNesrine Jaouabi, Wala Medfai, Marouan Khalifa, Rabia Benabderrahmane Zaghouani and Hatem EzzaouiaEur. Phys. J. Appl. Phys., 96 2 (2021) 20901DOI: https://doi.org/10.1051/epjap/2021210144