High-precision absolute lattice parameter determination of SrTiO₃, DyScO₃ and NdGaO₃ single crystals

The lattice parameters of three perovskite-related oxides have been measured with high precision at room temperature. An accuracy of the order of 10^-5 has been achieved by applying a sophisticated high-resolution X-ray diffraction technique which is based on the modified Bond method. The results on cubic SrTiO₃ [a = 3.905268 (98) Å], orthorhombic DyScO₃ [a = 5.442417 (54), b = 5.719357 (52) and c = 7.904326 (98) Å], and orthorhombic NdGaO₃ [a = 5.428410 (54), b = 5.498407 (55) and c = 7.708878 (95) Å] are discussed in view of possible systematic errors as well as non-stoichiometry in the crystals.