Speciation and Behavior of Niobium in the Fe–Ti–O System: Localization, Isomorphic Substitution, and Microphase Enrichment. - Sarsembekov, Turar Kusmanovich; Chepushtanova, Tatyana Alexandrovna; Merkibayev, Yerik Serikovich; Sharipov, Rustam Khassanovich; Bakhytuly, Nauryzbek (Metals (2075-4701), 2026)