材料科学
铁电性
钙钛矿(结构)
带隙
陶瓷
铁电陶瓷
电介质
四方晶系
压电
相(物质)
正交晶系
分析化学(期刊)
铌酸钾
光电子学
固溶体
结晶学
复合材料
化学
作者
Shufang Si,Hongmei Deng,Weixing Zhou,Tiantian Wang,Pingxiong Yang,Junhao Chu
标识
DOI:10.1016/j.ceramint.2018.05.088
摘要
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.
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