Back to Search
Start Over
Synthesis-Dependent First-Order Raman Scattering in SrTiO3 Nanocubes at Room Temperature
- Source :
- Chemistry of Materials. 20:5628-5635
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- Raman spectroscopy was used to demonstrate that the lattice dynamics of SrTiO3 (STO) nanoparticles strongly depends on their microstructure, which is in turn determined by the synthetic approach employed. First-order Raman modes are observed at room temperature in STO single-crystalline nanocubes with average edge lengths of 60 and 120 nm, obtained via sol-precipitation coupled with hydrothermal synthesis and a molten salt procedure, respectively. First-order Raman scattering arises from local loss of inversion symmetry caused by surface frozen dipoles, oxygen vacancies, and impurities incorporated into the host lattice. The presence of polar domains is suggested by the pronounced Fano asymmetry of the peak corresponding to the TO2 polar phonon, which does not vanish at room temperature. These noncentrosymmetric domains will likely influence the dielectric response of these nanoparticles.
- Subjects :
- Materials science
Phonon
General Chemical Engineering
General Chemistry
Molecular physics
Condensed Matter::Materials Science
symbols.namesake
Crystallography
X-ray Raman scattering
Impurity
Materials Chemistry
symbols
Hydrothermal synthesis
Coherent anti-Stokes Raman spectroscopy
Molten salt
Raman spectroscopy
Raman scattering
Subjects
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........1c9de9a4665f34cd55ad905b83b76d16
- Full Text :
- https://doi.org/10.1021/cm801192t