Valence states of titanium ions in corundum crystals Bagdasarov, Kh. S. ; Karyagin, V. F. ; Kevorkov, A. M. ; Sviridov, D. T. ; Uyukin, E. M. Abstract Publication: Crystallography Reports Pub Date: July 1994 Bibcode: 1994CryRp..39..590B