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Raman Spectra of Strontium Titanate
Author(s) -
Balachandran U.,
Eror N. G.
Publication year - 1982
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1982.tb10417.x
Subject(s) - raman spectroscopy , strontium titanate , tetragonal crystal system , impurity , phase boundary , brillouin zone , materials science , phase transition , condensed matter physics , phonon , perovskite (structure) , phase (matter) , strontium , chemistry , crystallography , optics , physics , thin film , nanotechnology , organic chemistry
At room‐temperature the Raman spectrum was second‐order, in agreement with, the selection rules for the cubic perovskite structure. The second‐order spectrum originates largely from pairs of phonons with wave vectors near the Brillouin zone boundary. First‐order Raman‐active modes predicted in the tetragonal phase of SrTiO 3 are observed on cooling to 120 K, where a new impurity‐related band is observed at 793 cm −1 . The presence of impurities raised the cubic to tetragonal phase transition temperature to 120 K.