Local Structure Evolution in   Ba  ‐Substituted   Pb  (  Fe   1/2   Nb   1/2 )  O   3  Ceramics | Zendy

Lv Xin | Zendy; Liu Guo | Zendy; Liu Xiao Qiang | Zendy; Chen Xiang Ming | Zendy

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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.

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