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Microstructural, ferroelectric, and photoluminescent properties of (100)‐oriented Sm 3+ ‐doped Na 0.5 Bi 0.5 TiO 3 thin films
Author(s) -
Huang Wenhua,
Du Xingru,
Ismail Muhammad,
Hao Aize,
Wu Jiang,
He Shuai,
Qin Ni,
Bao Dinghua
Publication year - 2018
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.15737
Subject(s) - materials science , ferroelectricity , thin film , dielectric , analytical chemistry (journal) , photoluminescence , doping , dopant , dielectric loss , raman spectroscopy , scanning electron microscope , mineralogy , nanotechnology , optics , chemistry , optoelectronics , composite material , physics , chromatography
(100) C ‐oriented Na 0.5 Bi 0.5‐ x S m x TiO 3 ( NBST ) lead‐free ferroelectric thin films were prepared on Pt/Ti/SiO 2 /Si substrates by chemical solution deposition method, and their microstructural, dielectric, ferroelectric, and photoluminescent properties were studied. X‐ray diffraction and scanning electron microscopy analysis indicated that both the grain size and (100) C orientation degree of NBST thin films were decreased by doping Sm 3+ ions. Raman spectra showed that structural symmetry of NBST thin films decreased at low Sm 3+ doping concentration and then increased at high doping concentration of Sm 3+ ions. An appropriate amount of Sm 3+ dopants was confirmed to enhance dielectric and ferroelectric properties of the NBST thin films. Among all the compositions, the Na 0.5 Bi 0.492 Sm 0.008 TiO 3 thin film exhibited the largest remnant polarization (2 P r ) of 27.3 μC/cm 2 and high dielectric constant of 1068, as well as a low dielectric loss of 0.04. Temperature‐ and frequency‐dependent dielectric characteristics illustrated the relaxor ferroelectric behavior of Na 0.5 Bi 0.492 Sm 0.008 TiO 3 thin film. Meanwhile, the Na 0.5 Bi 0.492 Sm 0.008 TiO 3 thin film also showed optimal orange‐red emission at 600 nm, which is originating from the 4 G 5/2 → 4 H 7/2 transition of Sm 3+ ions.