Lattice constant of strontium titanate at low temperatures

A double-crystal X-ray diffraction technique has been applied to the lattice constant measurement of SrTiO3 in the temperature range 17 to 300 K. A relative accuracy of 10−5 is attained. No anomaly on the lattice constant vs. temperature curve is detected except at the cubic-to-tetragonal transition at 106 K. The splitting of the h00 and 00l Bragg peaks are completely resolved below 85 K.