A new method was employed to measure the change of lattice parameters of single crystal SrTiO3 as a function of temperature from 77 to 150 °K. A clear indication of a phase transition at 108 °K was observed. The line splitting below 108 °K is consistent with tetragonal symmetry, the axial ratioc/a of the crystal lattice being 1.0004 at 77 °K. When comparing our results with recently performed meas...... hiện toàn bộ