Modified structure and optical band-gap in perovskite ferroelectric (1-x)KNbO3-xBaCo1/3Nb2/3O3 ceramics. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Si, Shufang; Deng, Hongmei; Zhou, Wenliang; Wang, Tiantian; Yang, Pingxiong; Chu, Junhao
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14638
• Page End: 14644
• Publication Date: 2018-08-15
• Subjects: Solid state reaction -- Composites -- Ferroelectric properties -- Perovskites; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.088
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the process of exploring ideal ferroelectric perovskites for photovoltaic applications, a novel kind of ceramic (1- x )KNbO3 - x BaCo1/3 Nb2/3 O3 ( x KBCNO) 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 Pm 3 m . 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 BaCo1/3 Nb2/3 O3 (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.