Durable Cr‐substituted (Ba,Cs) 1.33 (Cr,Ti) 8 O 16 hollandite waste forms with high Cs loading

Abstract A series of Cr‐substituted hollandite solid solution Ba x Cs y Cr 2x+y Ti 8−2x−y O 16 over a broad range of Cs content (x + y = 1.33, 0 ≤ x and y ≤ 1.33) were systematically investigated. A monoclinic‐to‐tetragonal phase transition was induced by increasing Cs content in the tunnel sites of the hollandite structure, and all members of the series show structure modulations related to the ordering of the Ba/Cs and vacancies along the tunnels. The thermodynamic stability of the Cr‐substituted hollandite samples was measured via high‐temperature oxide melt solution calorimetry, which incl... Mehr ...