Formation of contact and multiple cyclic cassiterite twins in SnO₂-based ceramics co-doped with cobalt and niobium oxides.

ABSTRACT: Contact and multiple cyclic twins of cassiterite commonly form in SnO₂-based ceramics when SnO₂ is sintered with small additions of cobalt and niobium oxides (dual doping). In this work, it is shown that the formation of twins is a two-stage process that starts with epitaxial growth of SnO₂ on CoNb₂O₆ and Co₄Nb₂O₉ seeds (twin nucleation stage) and continues with the fast growth of (101) twin contacts (twin growth stage). Both secondary phases form below the temperature of enhanced densification and SnO₂ grain growth; CoNb₂O₆ forms at ∼700°C and Co₄Nb₂O₉ at ∼900°C. They are structurally related to the rutile-type cassiterite and can thus t

SUBMITTER: Daneu N 

PROVIDER: S-EPMC9370213 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature