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Local Structure Evolution in Ba ‐Substituted Pb ( Fe 1/2 Nb 1/2 ) O 3 Ceramics
Author(s) -
Lv Xin,
Liu Guo,
Liu Xiao Qiang,
Chen Xiang Ming
Publication year - 2014
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/jace.13046
Subject(s) - raman spectroscopy , ferroelectricity , crystallography , octahedron , crystal structure , dielectric , materials science , x ray crystallography , tetragonal crystal system , diffraction , mineralogy , analytical chemistry (journal) , chemistry , physics , optoelectronics , optics , chromatography
Evolution of crystal structure in Pb 1‐ x Ba x ( Fe 1/2 Nb 1/2 ) O 3 ceramics has been investigated by X‐ray diffraction and Raman spectra analysis together with the dielectric characterization. The crystal structure for all compositions is cubic and the cell volume indicates a sudden change at x = 0.075. Pb 1‐ x Ba x ( Fe 1/2 Nb 1/2 ) O 3 ceramics with x > 0.075 are paraelectric, whereas those for x < 0.075 are ferroelectric at room temperature. The evolution of phonon modes indicates that the ferroelectricity of Pb 1‐ x Ba x ( Fe 1/2 Nb 1/2 ) O 3 solid solution ceramics is caused by the off‐center Nb 5+ in BO 6 octahedron. The ferroelectric‐related distortion is still observed in paraelectric solid solutions with x > 0.075.