Role of defects and oxygen vacancies on dielectric and magnetic properties of Pb2+ ion doped LaFeO3 polycrystalline ceramics

Small polaron conduction in lead modified lanthanum ferrite ceramics

“…As a typical application of these powders recently we have reported their low temperature butane sensing characteristics [18]. The electrical properties of nanocrystalline LaFeO 3 ceramics (ABO 3 type perovskite) can be tuned by aliovalent Pb 2+ doping replacing La 3+ at A site [19,20]. In the present paper we have systematically studied the phase formation behavior, microstructure and electrical characteristics of Pb 2+ modified LaFeO 3 ceramics.…”

Dielectric and optical properties of Ni-doped LaFeO3 nanoparticles

“…The doping at La and/ or Fe site of LaFeO 3 conducted by researchers is shown to display significant effects on many properties of LaFeO 3 . Some investigations have been reported for LFO bulk ceramics [26][27][28][29][30][31][32][33][34][35][36]. Improved dielectric and optical properties of doped LFO are important for its practical applications.…”

Investigation on electrical conductivity and dielectric property of La0.8Pb0.2(Fe,Ti)0.5O3ceramic nanoparticles

“…[1][2][3] Modification of their structure has been shown to play an important role in the optimization of their structural, optical and electrical properties. [2][3][4][5] In this context, cation substitution has been reported to produce cation displacement, which in turn contributes to the structural changes that result in the generation of dielectric dipoles. [1][2][3][4] Thus, Ti-substitution on the Fe site of LaFeO 3 introduced weak ferromagnetic ordering correlated with the 3d 0 valence electron of Ti-ions, resulting in a dielectric constant in the range of $ 10 3 .…”

“…[2][3][4][5] In this context, cation substitution has been reported to produce cation displacement, which in turn contributes to the structural changes that result in the generation of dielectric dipoles. [1][2][3][4] Thus, Ti-substitution on the Fe site of LaFeO 3 introduced weak ferromagnetic ordering correlated with the 3d 0 valence electron of Ti-ions, resulting in a dielectric constant in the range of $ 10 3 . 2 Pb-substitution on the La site of La 1Àx Pb x FeO 3 demonstrated typical colossal dielectric constant (higher than 10 4 ) behavior for x > 0:1 in the temperature range of 300-450 K, and the highest dielectric constant was found to be $ 30:000 for the sample with x ¼ 0:2.…”

“…2 Pb-substitution on the La site of La 1Àx Pb x FeO 3 demonstrated typical colossal dielectric constant (higher than 10 4 ) behavior for x > 0:1 in the temperature range of 300-450 K, and the highest dielectric constant was found to be $ 30:000 for the sample with x ¼ 0:2. 3,4 Moreover, the presence of a hopping polaron as the charge carrier was detected in the relaxation and conduction process. 3 Motivated by the magnetic ordering and high dielectric constant introduced by Ti-and Pb-substitution, we decided to modify LaFeO 3 by simultaneously substituting the La and Fe sites with Ti-and Pb-ions.…”