Low-temperature dielectric properties of doped SrTiO3 single crystals and valency of ions Original Research Article

This work is dedicated to the research of the dielectric parameters ε0 and tan δ and the electronic state of regular and doped ions in pure and doped strontium titanate single crystals under T=10–300 K. An anomaly of the temperature dependence of the dielectric parameters between 10 and 100 K was discovered for separate doped samples. The essential change of spectroscopic parameters and transition of some part of Ti4+ ions into Ti2+,3+ states has been studied in detail.