Effect of FetO on viscosity and structure of Na2O3-B2O3-CaO-SiO2-Al2O3 slag Junli Guo, Jin Zou, Huihui Yu, Kai Hu and Qiang Hu Metall. Res. Technol., 121 6 (2024) 622 Published online: 19 November 2024 DOI: 10.1051/metal/2024095