Tran, C., Ninh Duc Ha, Dang Quoc Khanh, Nguyen Van Canh, Ho Ngoc Minh, Trieu Khuong, Nguyen Thi Hoa, Ngo Van Hoanh and Le Trung Hieu 2025. The process of phase formation in the synthesis of Al2O3 - Y2O3 - SiO2 frit by sol-gel and coprecipitation method. Journal of Military Science and Technology. 104, 104 (Jun. 2025), 94–102. DOI:https://doi.org/10.54939/1859-1043.j.mst.104.2025.94-102.