Effect of rare-earth Nd/Sm doping on the structural and multiferroic properties of BiFeO3 ceramics prepared by spark plasma sintering. Issue 10 (July 2020)

• Record Type: Journal Article
• Authors: Wang, Ting; Wang, X.-L.; Song, S.-H.; Ma, Qing
• Is Part Of: Ceramics international. Volume 46:Issue 10(2020)Part A
• Page Start: 15228
• Page End: 15235
• Publication Date: 2020-07
• Subjects: Multiferroics -- BiFeO3 ceramics -- Nd doping -- Sm doping -- Ferroelectric properties -- Magnetic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.03.061
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Multiferroic Nd/Sm-doped BiFeO3 ceramics synthesized at 700 °C by spark plasma sintering in conjunction with sol-gel precursor powders are investigated by X-ray diffraction, scanning electron microscopy, dielectric, ferroelectric and magnetic measurements. With the doping content of Nd/Sm beyond 10 mol%, the crystal structure changes from R 3 c to coexistence of Pbam and R 3 c . It is also revealed that the grain size for all samples greatly decreases and the dielectric, ferroelectric and magnetic properties are obviously improved with Nd/Sm doping. The optimized remanent polarization are about 1.451 μC/cm 2 and 3.448 μC/cm 2 for the 10 mol% Nd-doped and 15 mol% Sm-doped BiFeO3 ceramics, respectively. Because of the reduced concentration of oxygen vacancies, the leakage current density of Nd/Sm-doped ceramics decreases more than two orders of magnitude compared to the pure BiFeO3 sample. The maximum remanent magnetization for the Sm-doped ceramics is approximately 0.279 emu/g, which is higher than that for the Nd-doped samples (0.263 emu/g).