Document Detail


Phonon behavior of CaSnO(3) perovskite under pressure.
MedLine Citation:
PMID:  22168703     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Raman scattering and x-ray diffraction studies of CaSnO(3) perovskite were performed under high-pressure conditions. This high-pressure study was motivated by a recent theoretical study predicting a phase transition in CaSnO(3) from GdFeO(3)-type perovskite to CaIrO(3)-type structure occurred at 12 GPa. Despite no obvious structure change up to a pressure of 26 GPa based on the x-ray diffraction data, high pressure Raman measurements revealed that some Raman modes disappeared upon compression; either merging into neighboring bands or vanishing. The signals for these Raman peaks were recovered during decompression. The measured pressure derivative of Raman shift (∂ν∕∂P) of CaSnO(3) ranged from ∼1.29 to ∼4.35, up to 20 GPa. Due to the lack of lattice dynamic study for CaSnO(3) perovskite, the mode symmetry for CaSnO(3) was tentatively assigned based on the empirical relation among Ca-bearing perovskites. The pressure derivative of the Raman shifts was found to be related to their mode vibrations: modes related to Ca and O shifts had a strong pressure dependence compared with those associated with oxygen octahedral rotation.
Authors:
Jennifer Kung; Yi-Ji Lin; Chih-Ming Lin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  135     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  224507     Citation Subset:  IM    
Affiliation:
Department of Earth Sciences, National Cheng Kung University, Tainan 70101, TaiwanDepartment of Applied Science, National Hsinchu University of Education, Hsinchu 30061, Taiwan.
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