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Chemical solution deposition as a route to narrow-band gap and room-temperature ferromagnetic perovskite [K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]x films

Published online by Cambridge University Press:  06 September 2019

Xuezhen Zhai ,
Shizhuo Wang ,
Cui Shang  and
Pingxiong Yang
Xuezhen Zhai*
Affiliation:
School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Henan 450002, China Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of electronics, East China Normal University, Shanghai 200241, China
Shizhuo Wang
Affiliation:
School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Henan 450002, China
Cui Shang
Affiliation:
School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Henan 450002, China
Pingxiong Yang
Affiliation:
Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of electronics, East China Normal University, Shanghai 200241, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

[K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]x (KNBNNO, 0 ≤ x ≤ 0.3) films have been fabricated on different substrates for the first time, using a modified chemical solution deposition method. The microstructure, optical properties, ferromagnetism, and substrate effects of KNBNNO films were assessed, and we found that BaNi0.5Nb0.5O3−δ (BNNO) content was a key factor in determining the properties of the final products. The lower band gap of KNBNNO is due to the band-to-band transition from hybridized Ni 3d and O 2p to Nb 4d states. Moreover, with increasing x from 0 to 0.3, the magnetism transition process of the samples from diamagnetism to ferromagnetism may originate from the competition between ferromagnetic exchange interactions in Ni2+–VO2−–Ni2+ and superexchange interactions in Ni2+–Ni2+. Notably, absorption behaviors in the visible light wave band for KNBNNO films have been realized, which makes it possible to use KNBNNO films for perovskite solar cell applications.

Keywords

[K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]xstructureferromagnetismoptical propertiesfilms
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3627 - 3635
Copyright
Copyright © Materials Research Society 2019 

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