Abstract
The pressure dependence of the Raman spectra of SrTiO3 was investigated up to 15.5 GPa. The anti-ferrodistortive cubic–tetragonal phase transition (phonon condensation at the R point of the Brillouin zone) occurs at about 6 GPa. The strong, broad bands, present under ambient conditions, sharpen and change their profile with increasing pressure. They diminish rapidly in their intensity above 13 GPa and disappear by 15.5 GPa. These pressure-induced changes can be due to increasing harmonicity of the stretching and bending Ti–O vibrations, leading to reduced intensity of the second-order Raman scattering, and/or due to the inhibition of the off-center dynamic distortions at the Ti4+ cation sites, and thus due to the decrease in intensity of the ‘disorder-induced’ first-order Raman scattering. The spectrum at 15.5 GPa shows weak band splittings, which might indicate a further transformation to an orthorhombic phase of SrTiO3. © 1997 John Wiley & Sons, Ltd.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
