Modified structure and optical band-gap in perovskite ferroelectric (1-x)KNbO3-xBaCo1/3Nb2/3O3 ceramics

Shufang Si; Hongmei Deng; Wenliang Zhou; Tiantian Wang; Pingxiong Yang; Junhao Chu

doi:10.1016/j.ceramint.2018.05.088

Modified structure and optical band-gap in perovskite ferroelectric (1-x)KNbO₃-xBaCo_1/3Nb_2/3O₃ ceramics

Shufang Si
, Hongmei Deng
, Wenliang Zhou
, Tiantian Wang
, Pingxiong Yang^*
, Junhao Chu

^*Corresponding author for this work

School of Physics and Electronic Science

East China Normal University
Shanghai University

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

In the process of exploring ideal ferroelectric perovskites for photovoltaic applications, a novel kind of ceramic (1-x)KNbO₃-xBaCo_1/3Nb_2/3O₃ (xKBCNO) has been synthesized using solid-state method. The phase transition, microstructure, optical and ferroelectric properties of the compounds were investigated in detail. X-ray diffraction and Raman scattering spectra analyses indicate that single phase ceramics have been formed with cubic perovskite structure in space group Pm3m. Obvious crystal lattice expansion can be found as x increases. A narrow band gap of 1.87 eV is observed at x = 0.75, which proves the dramatic effect of BaCo_1/3Nb_2/3O₃ (BCNO) addition on the energy band gap. Besides, the room-temperature ferroelectricity has been detected in KBCNO ceramics controlled by the BCNO doping content. These results lay a solid foundation on further exploring the phase transition, band gap engineering, and electric properties in perovskite oxides, and indicate potential applications in perovskite solar cells.

Original language	English
Pages (from-to)	14638-14644
Number of pages	7
Journal	Ceramics International
Volume	44
Issue number	12
DOIs	https://doi.org/10.1016/j.ceramint.2018.05.088
State	Published - 15 Aug 2018

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Keywords

Composites
Ferroelectric properties
Perovskites
Solid state reaction

Access to Document

10.1016/j.ceramint.2018.05.088

Cite this

@article{11f0e3d308fb4b36a56923554cea1afe,

title = "Modified structure and optical band-gap in perovskite ferroelectric (1-x)KNbO3-xBaCo1/3Nb2/3O3 ceramics",

abstract = "In the process of exploring ideal ferroelectric perovskites for photovoltaic applications, a novel kind of ceramic (1-x)KNbO3-xBaCo1/3Nb2/3O3 (xKBCNO) has been synthesized using solid-state method. The phase transition, microstructure, optical and ferroelectric properties of the compounds were investigated in detail. X-ray diffraction and Raman scattering spectra analyses indicate that single phase ceramics have been formed with cubic perovskite structure in space group Pm3m. Obvious crystal lattice expansion can be found as x increases. A narrow band gap of 1.87 eV is observed at x = 0.75, which proves the dramatic effect of BaCo1/3Nb2/3O3 (BCNO) addition on the energy band gap. Besides, the room-temperature ferroelectricity has been detected in KBCNO ceramics controlled by the BCNO doping content. These results lay a solid foundation on further exploring the phase transition, band gap engineering, and electric properties in perovskite oxides, and indicate potential applications in perovskite solar cells.",

keywords = "Composites, Ferroelectric properties, Perovskites, Solid state reaction",

author = "Shufang Si and Hongmei Deng and Wenliang Zhou and Tiantian Wang and Pingxiong Yang and Junhao Chu",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd and Techna Group S.r.l.",

year = "2018",

month = aug,

day = "15",

doi = "10.1016/j.ceramint.2018.05.088",

language = "英语",

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T1 - Modified structure and optical band-gap in perovskite ferroelectric (1-x)KNbO3-xBaCo1/3Nb2/3O3 ceramics

AU - Si, Shufang

AU - Deng, Hongmei

AU - Zhou, Wenliang

AU - Wang, Tiantian

AU - Yang, Pingxiong

AU - Chu, Junhao

PY - 2018/8/15

Y1 - 2018/8/15

N2 - In the process of exploring ideal ferroelectric perovskites for photovoltaic applications, a novel kind of ceramic (1-x)KNbO3-xBaCo1/3Nb2/3O3 (xKBCNO) has been synthesized using solid-state method. The phase transition, microstructure, optical and ferroelectric properties of the compounds were investigated in detail. X-ray diffraction and Raman scattering spectra analyses indicate that single phase ceramics have been formed with cubic perovskite structure in space group Pm3m. Obvious crystal lattice expansion can be found as x increases. A narrow band gap of 1.87 eV is observed at x = 0.75, which proves the dramatic effect of BaCo1/3Nb2/3O3 (BCNO) addition on the energy band gap. Besides, the room-temperature ferroelectricity has been detected in KBCNO ceramics controlled by the BCNO doping content. These results lay a solid foundation on further exploring the phase transition, band gap engineering, and electric properties in perovskite oxides, and indicate potential applications in perovskite solar cells.

AB - In the process of exploring ideal ferroelectric perovskites for photovoltaic applications, a novel kind of ceramic (1-x)KNbO3-xBaCo1/3Nb2/3O3 (xKBCNO) has been synthesized using solid-state method. The phase transition, microstructure, optical and ferroelectric properties of the compounds were investigated in detail. X-ray diffraction and Raman scattering spectra analyses indicate that single phase ceramics have been formed with cubic perovskite structure in space group Pm3m. Obvious crystal lattice expansion can be found as x increases. A narrow band gap of 1.87 eV is observed at x = 0.75, which proves the dramatic effect of BaCo1/3Nb2/3O3 (BCNO) addition on the energy band gap. Besides, the room-temperature ferroelectricity has been detected in KBCNO ceramics controlled by the BCNO doping content. These results lay a solid foundation on further exploring the phase transition, band gap engineering, and electric properties in perovskite oxides, and indicate potential applications in perovskite solar cells.

KW - Composites

KW - Ferroelectric properties

KW - Perovskites

KW - Solid state reaction

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