Microstructural, ferroelectric, and photoluminescent properties of (100)‐oriented Sm3+‐doped Na0.5Bi0.5TiO3 thin films. Issue 10 (10th May 2018)

• Record Type: Journal Article
• Authors: Huang, Wenhua; Du, Xingru; Ismail, Muhammad; Hao, Aize; Wu, Jiang; He, Shuai; Qin, Ni; Bao, Dinghua
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 10(2018)
• Page Start: 4645
• Page End: 4653
• Publication Date: 2018-05-10
• Subjects: chemical solution deposition -- ferroelectric -- Na0.5Bi0.5‐xSmxTiO3 thin films -- orientation -- photoluminescence; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15737
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: (100)C ‐oriented Na0.5 Bi0.5‐ x Sm x TiO3 (NBST) lead‐free ferroelectric thin films were prepared on Pt/Ti/SiO2 /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 Na0.5 Bi0.492 Sm0.008 TiO3 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 Na0.5 Bi0.492 Sm0.008 TiO3 thin film. Meanwhile, the Na0.5 Bi0.492 Sm0.008 TiO3 thin film also showed optimal orange‐red emission at 600 nm, which is originating from the 4 G5/2 → 4 H7/2 transition of Sm 3+ ions.