Studies in Lithium Oxide Systems: VI, Progress Report on the System Li 2 O‐SiO 2 ‐TiO 2

Data on compatibility triangles and liquid immiscibility are presented for the portion of the ternary system bounded by SiO 2 , Li 2 O, SiO 2 , Li 0 O TiO 2 , and TiO 2 . X‐ray data showed the ternary compound Li 2 O. TiO 2 . SiO 2 to be tetragonal with a = 6.41 a.u. and C = 4.40 a.u. The compound is uniaxial negative with 1.81 < < 1.82 and 1.83 < < 1.84. It melted to two liquids at 1207° 3°C. Seven joins were established by solid‐state, fusion, and quenching methods. Using electron microscopy and petrographic microscope and quenching data, liquid immiscibility originating in the binary system SiO 2 ‐TiO 2 was shown to extend over a substantial portion of the ternary system.