Electrical characterization of Ir doped rare-earth orthoferrite YbFeO3

Structural, 57Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd0.33Eu0.67Fe1-Cr O3 particles

“…It goes without saying that at the surface of the nanoparticles, the bonding of both ions and O 2need not be that of the ideal Fe3O4. Such a reduction of Fe 3+ to Fe 2+ at the surface has indeed been reported for other rare earth orthoferrites prepared by J o u r n a l P r e -p r o o f mechanical milling such as PrFeO3 [49] or by the conventional ceramic technique such as ErFeO3 [50] and Ir-doped YbFeO3 [51]. Li et al have attributed the existence of Fe 2+ ions at the surfaces of the orthoferrite particles to the presence of oxygen vacancy as inevitable point defects in these perovskite-related materials [50].…”

Synthesis, structural, dielectric and optical properties of chitosan-MgO nanocomposite

“…For the above reasons, in this study, we have synthesized CS-MgO nanocomposite film via a simple casting method and investigated its optical and dielectric properties ( Figure 2). The calculation of dielectric constant and loss and its relationship to frequency and temperature enhances the understanding of the polarization method, conduction process, optical properties, effect of impurities and phase change [15][16][17][18][19][20][21].…”

Structural, morphological, Raman, dielectric and electrical properties of La1−2xBaxBixFeO3 (0.00 ≤ x ≤ 0.20) compounds

“…We can mention also that all relaxation peaks shift towards higher frequencies when increasing the temperature which confirms well the thermally activated relaxation processes. 54 It is important to note the existence of a pure conduction process occurring generally at low frequencies where ions move freely on long-distance. 55 When relaxation peaks shift to high frequencies, almost ions will be confined in the localized motion corresponding to the short-distance carriers hopping process.…”