![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
The phase transition of SrTiO3 at 105 K has been examined by studying the temperature dependence of the Young's modulus of SrTiO3 crystals along various directions. Dynamic Mechanical Analysis (DMA) at 10–140K. and 10–45Hz has been used for the experiments. The elastic behaviour is interpreted in terms of Landau theory and the DMA results are compared with ultrasonic experiments. The striking differences between the two types of data are attributed to the occurrence of domain wall motions at low frequencies. These motions are suppressed at high frequencies (ultrasonics). We have studied the temperature behaviour of the low-frequency elastic constants of SrTiO3 as function of external stress. The data analysis shows that the domain wall contribution to the elastic constants is essentially suppressed with increasing of uniaxial compression.