Abstract
Monoclinic ZrO2 crystals were grown in mixed fluxes: PbF2-KF, PbF2-B2O3 and PbF2-KF-B2O3. Although crystals grown from the PbF2-KF flux are tabular, those grown from the mixed fluxes containing the B2O3 component always occur in a special mode of aggregation of twinned acicular crystals.
The origin of striations is discussed on the basis of convection due to a change in the solute concentration of the B2O3 component in the flux melts.
