Strain Engineered CaBi2Nb2O9 Thin Films with Enhanced Electrical Properties.
In this work, strain engineered polycrystalline thin films (∼250 nm) of bismuth layer-structured ferroelectric (BLSF) CaBi2Nb2O9 (CBNO) were prepared by using a radio frequency (RF) magnetron sputtering technique. XRD analysis revealed that the films were (200)/(020) and (00l) textured with a large in-plane tensile stress. Cross-sectional TEM analyses confirmed the bismuth layered-structure, as well as crystalline orientations and a strain-controlled growth mode of the grains. Result of a quantitative XPS analysis revealed that the composition of the film is close to the chemical stoichiometry. Excellent electrical properties were achieved in the CBNO films, including a high dielectric constant (∼280 @5 kHz), a small dielectric loss (tgδ ≤ 1.6% up to an applied electric field of ∼1200 kV/cm) and a large polarization (Pr ≈ 14 μC/cm(2) @ 1 kHz).
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Yunxiang
Y
Zhang
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.|National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.
Jun
J
Ouyang
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Jincan
J
Zhang
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Yao
Y
Li
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Hongbo
H
Cheng
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Huiwen
H
Xu
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.|Suzhou Institute of Shandong University , Suzhou 215123, China.
Menglin
M
Liu
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.
Zhao-Peng
ZP
Cao
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.
Chun-Ming
CM
Wang
bismuth layer-structured ferroelectrics (BLSFs); calcium bismuth niobate (CaBi2Nb2O9); electrical property; magnetron sputtering; strain engineering