Ac-conductivity and structural, magnetic, dielectric, and photocatalytic properties of Gd doped BiFeO3 nanoparticles

Ac-conductivity and structural, magnetic, dielectric, and photocatalytic properties of Gd doped BiFeO3 nanoparticles

WoS Article

In this study, a series of Bi1-xGdxFeO3 (x = 0, 0.05, 0.1, 0.15, and 0.2) samples synthesized by a combustion method were investigated. The effect of Gd dopant on the crystal structure, morphology, magnetic, electrical and photocatalytic properties of nanoparticles was studied. X-ray diffraction showed that the samples with x = 0.1 and 0.15 contain two-phase systems R3c + Pbam and R3c + Pnma, respectively. UV-vis spectroscopy showed that the optical band gap lies in the range of 2.08-1.94 eV, which implies possible applications in the visible spectrum. The samples demonstrated ferromagnetic behavior with the highest magnetization values for Bi0.9Gd0.1FeO3. Three anomalies were found in the temperature dependences of the permittivity epsilon '(T) in the temperature range of similar to 250 degrees C to similar to 310 degrees C and TN. The absence of an unambiguous dependence of the dielectric characteristics with increasing Gd concentration was observed. The frequency dependence of the conductivity sigma ac(omega) at different temperatures was analyzed based on the universal Jonscher's power law sigma similar to omega s. The frequency dependence of the conductivity sigma ac was interpreted within the framework of the correlated barrier jumping (CBH) model. The plots of ln sigma acvs. 103/T revealed the presence of various thermally activated conductivity mechanisms. A positive effect of the Gd dopant on the improvement of the photocatalytic properties of BiFeO3 was established.

In this study, a series of Bi1-xGdxFeO3 (x = 0, 0.05, 0.1, 0.15, and 0.2) samples synthesized by a combustion method were investigated. The effect of Gd dopant on the crystal structure, morphology, magnetic, electrical and photocatalytic properties of nanoparticles was studied. X-ray diffraction showed that the samples with x = 0.1 and 0.15 contain two-phase systems R3c + Pbam and R3c + Pnma, respectively. UV-vis spectroscopy showed that the optical band gap lies in the range of 2.08-1.94 eV, which implies possible applications in the visible spectrum. The samples demonstrated ferromagnetic behavior with the highest magnetization values for Bi0.9Gd0.1FeO3. Three anomalies were found in the temperature dependences of the permittivity epsilon '(T) in the temperature range of similar to 250 degrees C to similar to 310 degrees C and TN. The absence of an unambiguous dependence of the dielectric characteristics with increasing Gd concentration was observed. The frequency dependence of the conductivity sigma ac(omega) at different temperatures was analyzed based on the universal Jonscher's power law sigma similar to omega s. The frequency dependence of the conductivity sigma ac was interpreted within the framework of the correlated barrier jumping (CBH) model. The plots of ln sigma acvs. 103/T revealed the presence of various thermally activated conductivity mechanisms. A positive effect of the Gd dopant on the improvement of the photocatalytic properties of BiFeO3 was established.

ELECTRICAL-PROPERTIESOPTICAL-PROPERTIESCRYSTAL-STRUCTUREMETHYLENE-BLUETHIN-FILMSDEGRADATIONTEMPERATUREBEHAVIORSPECTROSCOPYIRRADIATION

ELECTRICAL-PROPERTIESOPTICAL-PROPERTIESCRYSTAL-STRUCTUREMETHYLENE-BLUETHIN-FILMSDEGRADATIONTEMPERATUREBEHAVIORSPECTROSCOPYIRRADIATION

Gyulakhmedov, RR; Faradzhev, SP; Khrustalev, AN; Sobola, D; Sadykov, SA; Abdurakhmanov, MG; Abdulvakhidov, KG; Rabadanov, KS; Orudzhev, FF; Alikhanov, NMR

04.08.2025

Journal of Materials Chemistry C

36

04 Aug 2025

United Kingdom of Great Britain and Northern Ireland

18

https://pubs.rsc.org/en/content/articlelanding/2025/tc/d5tc01606a