A-site strontium doping effects on structure, magnetic, and photovoltaic properties of (Bi1−xSrx)FeO3−δ multiferroic ceramics. Issue 7 (August 2015)

• Record Type: Journal Article
• Authors: Tu, Chi-Shun; Xu, Zhe-Rui; Schmidt, V.H.; Chan, Ting-Shan; Chien, R.R.; Son, Hyungbin
• Is Part Of: Ceramics international. Volume 41:Issue 7(2015)
• Page Start: 8417
• Page End: 8424
• Publication Date: 2015-08
• Subjects: B. X-ray methods -- C. Magnetic properties -- C. Optical properties -- D. Perovskite; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.03.043
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Raman spectroscopy, X-ray diffraction (XRD), magnetization hysteresis loop, synchrotron X-ray absorption spectroscopy, and photovoltaic effects have been measured in (Bi1− x Sr x )FeO3− δ (BFO100 x Sr) ceramics for x =0.0, 0.05, 0.10, and 0.15. Raman spectra and XRD reveal a rhombohedral R3c structure in all compounds. A-site Sr 2+ doping increases fluctuations in cation-site occupancy and causes broadening in Raman modes. BFO15Sr exhibits a strong ferromagnetic feature due to reduction of FeOFe bond angle evidenced by the extended synchrotron X-ray absorption fine structure. The heterostructure of indium tin oxide (ITO) film/(Bi1− x Sr x )FeO3− δ ceramic/Au film exhibit clear photovoltaic (PV) responses under blue illumination of λ =405 nm. The maximal power-conversion efficiency and external quantum efficiency in ITO/BFO5Sr/Au are about 0.004% and 0.2%, respectively. A model based on optically excited charges in the depletion region between ITO and (Bi1− x Sr x )FeO3− δ can well describe open-circuit voltage and short-circuit current as a function of illumination intensity.