Effect of Yb substitution on room temperature magnetic and dielectric properties of bismuth ferrite nanoparticles

Abstract

Effect of the Yb dopant on the structural, magnetic, and electrical properties of the multiferroic BiFeO3 have been studied. The structural properties of sol-gel derived Bi1-xYbxFeO3 (x = 0.0, 0.1, and 0.2) nanoparticles reveal the formation of a rhombohedrally distorted perovskite in XRD and a reduction in the average grain size have been observed with an increase in the Yb concentration. Microstructural studies exhibited the formation of sphere like morphology with decreasing particle size with increase in the dopant concentration. The effective doping also resulted in larger magnetization as well as coercivity with the maximum of 257 Oe and 1.76 emu/g in the Bi0.8Yb0.2FeO3 nanoparticles. Ferroelectric as well as dielectric properties of the nanoparticles were also improved on doping. The best results were obtained for the BiFeO3 nanoparticles having Yb concentration x = 0.2.

Development of BiFeO3/MnFe2O4 ferrite nanocomposites with enhanced magnetic and electrical properties

“…Another approach for enhancing the physical properties of the BFO system is to form composites with different materials. [16][17][18][19] Synthesizing composite structures at the nanoscale has become an attractive approach for designing new multiferroic materials and is gaining much attention as they show multifunctionality arising from the properties and geometries of the constituting phases. 20 Both powder and thin lm nanocomposites of BiFeO 3 have been studied to date including those with ferrites of Mg, Co, Cu, Ni, Zn, and with PZT/BaTiO 3 etc.…”

Efficient and Stable Perovskite Solar Cells by B-Site Compositional Engineered All-Inorganic Perovskites and Interface Passivation

“…In this study, Nd 3+ is used to partially substitute Pb 2+ within CsPbI 2 Br to create novel CsPbI 2 Br: x Nd 3+ perovskites. Nd 3+ is selected for partial substitution of Pb 2+ at the B-site within CsPbI 2 Br since such heterovalent substitution could generate the vacancy, resulting in tunable optoelectronic properties of the resultant perovskite. ,− Moreover, the RE 3+ cation is selected as the dopant since it can stabilize the phase and reduce crystal impurity. − Furthermore, Nd 3+ has been used to tune the optoelectronic properties of inorganic perovskite materials . In addition, the ionic radii (112 pm) of Nd 3+ is similar to that (133 pm) of Pb 2+ .…”

“…On the other hand, the studies demonstrated that partially substituted the B-site Pb 2+ by other metal cations within perovskites could refine crystallization, stabilize crystal phases, tune dimensionality, and modify optoelectronic properties of perovskites. ,,− We reported novel perovskites, MAPb 1– x Co x I 3 (where MA = CH 3 NH 3 + , and x = 0.1, 0.2, and 0.4 mol %), with tuned crystal structure (cubic rather than tetragonal) and boosted electrical conductivities. , We further demonstrated that the PSCs based on the MAPb 0.9 Co 0.1 I 3 thin film exhibited a short-circuit current ( J SC ) of 24.42 mA/cm 2 , an open-circuit voltage ( V OC ) of 1.07 V, and a fill factor (FF) of 82.0%, with a corresponding PCE of 21.43%, which is about 22% enhancement compared to those based on pristine MAPbI 3 thin film . Furthermore, studies illustrated that rare earth cations (RE 3+ ) can reduce impurity phases, eliminate deep defects, hamper chemical fluctuation, and improve film quality of the resultant RE 3+ -doped materials. − RE materials also possess great potential in optoelectronic applications owing to their unique physical properties. , For example, the Er- and Yb-doped NaYF 4 phosphors have been widely investigated in inorganic solar cells due to their unique up-conversion function to defeat the Shockley–Queisser limit for photovoltaic energy conversion efficiency . Therefore, the heterovalent substitution of Pb 2+ with Nd 3+ is anticipated to tune the vacancies at the B-site within perovskites by utilizing the low-lying 4f orbitals to boost the optoelectronic properties of the inorganic-based perovskites. , Toward this end, we have utilized Nd 3+ to partially substitute Pb 2+ for generating novel hybrid inorganic–organic perovskites, MAPbI 3 : x Nd 3+ (where x = 0.1, 0.5, 1.0, and 5.0 mol %) and found the resultant perovskites possessed both enhanced and balanced charge transport. , Moreover, the PSCs based on the MAPbI 3 : x Nd 3+ thin films exhibited a PCE of 21.15% and dramatically suppressed photocurrent hysteresis. , …”

Ferroelectric Polarization Induced Selective Growth of BiFeO3 Nanocrystals with a Remarkable Ferromagnetism

“…Solid‐state reaction method has been widely used to prepare BFO ceramic materials but suffers from a volatility of bismuth and severe aggregation, resulting in a large size and extremely weak ferromagnetism , . In contrast, wet‐chemical techniques such as sol‐gel method,, , , co‐precipitation and auto‐combustion method have been reported to yield BFO nanostructures with less impurities, and ferromagnetic properties of the nanostructures were also improved to some extent. However, aggregation induced by subsequent calcination procedure remains challenging.…”