New modification of 3ZnO·Nb2O5

Phase relations in the ternary system ZnONb2O5SiO2 have been determined at liquidus and sub-solidus temperatures. The following compounds have been encountered as primary phases: ZnO, 3ZnO·Nb2O5, α-ZnO·Nb2O5, β-ZnO·Nb2O5, 2ZnO·17Nb2O5, HNb2O5, silica (either as tridymite or as cristobalite) and α-2ZnO·SiO2. No ternary phase has been encountered in this system. Five ternary invariant points have been located, four of which are eutectics, the remaining one being a peritectic. Sub-solidus compatibility relationships have also been determined. This ternary system was studied using hot-stage microscopy, quenching, and X-ray diffraction techniques.

R.R. Dayal

Papers

Phase relations in the system ZnONb2O5SiO2