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Temperature‐dependent Raman scattering in ferroelectric Bi 4− x Nd x Ti 3 O 12 ( x = 0, 0.5, 0.85) single crystals
Author(s) -
Liang Kun,
Qi Yajun,
Lu Chaojing
Publication year - 2009
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2376
Subject(s) - raman spectroscopy , orthorhombic crystal system , monoclinic crystal system , ferroelectricity , crystallography , raman scattering , tetragonal crystal system , materials science , ion , perovskite (structure) , dielectric , analytical chemistry (journal) , crystal structure , chemistry , physics , optics , optoelectronics , organic chemistry , chromatography
The temperature‐dependent Raman spectra of ferroelectric Bi 4− x Nd x Ti 3 O 12 ( x = 0, 0.5, 0.85) single crystals were recorded from 100 to 800 K. It was found that there is a critical Nd content x 0 between 0.5 and 0.85. The Nd 3+ ions prefer to replace Bi 3+ ions in pseudo‐perovskite layers when x < x 0 , while they might begin to incorporate into (Bi 2 O 2 ) 2+ layers when x ≥ x 0 . Nd substitution leads to a decrease in the ferroelectric–paraelectric transition temperature ( T c ). A monoclinic distortion of orthorhombic structure occurs in Bi 4 Ti 3 O 12 crystals at temperatures below 200 K. Copyright © 2009 John Wiley & Sons, Ltd.
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