Structural and magnetic properties of YFe(1-x)CoxO3 (0.1<x<0.5) perovskite nanomaterials synthesized by coprecipitation method

Abstract

YFe 1−x CoxO 3 (0.1 ≤ x ≤ 0.5) perovskite-type nanomaterials were successfully synthesized by the chemical co-precipitation method via the hydrolysis of Y(III), Fe(III) and Co(II) cations in boiling water using 5 % aqueous KOH solution as a precipitating agent. Along with the increase of cobalt ion concentration (x values, from 0.1 to 0,5), there was an decrease in the crystallite size nanomaterials (from 25.68 to 22.89 nm), as well as in the lattice constants (a = 5.5781-5.5217Å; b = 5.2732-5.2177Å, c = 7.5902-7.5009Å; V = 223.26-216.11Å), but there was an increase in the magnetic parameters including coercive force (Hc = 88.86 Oe), remnant magnetization (Mr = 0.031-0.268 emu/g), saturation magnetization (Ms = 0.413-1.006 emu/g) and maximum energy product ((BH)max = 0.413-1.006 emu/g).

Sol-gel synthesis and the investigation of the properties of nanocrystalline holmium orthoferrite

“…Based on these calculations, we can conclude that the crystallite size does not exceed 30 nm for HoFeO 3 . The calculation of the unit cell parameters from the diffractometry data showed that an increase in the annealing temperature led to a slight increase in the unit cell volume (Table 1), which was also observed in studies [36,37]. As shown in the study [36], a reliable estimate of the crystallite size from the broadening of diffraction peaks is possible only in combination with additional structural data, for example, with the results of electron microscopy.…”

“…The calculation of the unit cell parameters from the diffractometry data showed that an increase in the annealing temperature led to a slight increase in the unit cell volume (Table 1), which was also observed in studies [36,37]. As shown in the study [36], a reliable estimate of the crystallite size from the broadening of diffraction peaks is possible only in combination with additional structural data, for example, with the results of electron microscopy. SEM, TEM images, and a histogram of the particle size distribution of HoFeO 3 nanopowders synthesized by the sol-gel method from an aqueous solution in the presence of PVA after annealing at 750 • C for 60 min are shown in Fig.…”

Simple Synthesis of NdFeO3 Nanoparticles By the Co-Precipitation Method Based on a Study of Thermal Behaviors of Fe (III) and Nd (III) Hydroxides

“…Meanwhile, ceramic NdFeO3 nanoparticles typically achieve a saturation magnetization of s 0.7 M < emu/g or s 1.0 M > emu/g, as presented in [32] and [14], respectively, at the external magnetic field of 600 Oe. Another interesting feature here is that the saturation magnetization of the NdFeO3 nanoparticles was significantly higher than those of other orthoferrites of rare-earth elements RFeO3 (R = La, Y) [23][24][25][26][27]. Therefore, the NdFeO3 nanoparticles have potential applications to fabricate devices that can be applied in a high magnetic field.…”

“…Pure RFeO 3 orthoferrites (where R is La or Y), as well as RFeO 3 orthoferrites doped by Ca, Ba, Zn, and Co cations, can be produced by the following two-step approach without any surfactant: (1) the hydrolysis of cations in boiling water and (2) precipitation using appropriate agents [22][23][24][25][26][27]. This two-step process to synthesize the nanoscale NdFeO 3 has not been reported in the literature so far.…”

BiFeO3-Montmorillonite intercalated nano composites - synthesis and its characterization

“…Bismuth ferrite (BFO) have been attracted considerable interest due to their unique optical and electrical properties, and a wide variety of potential applications for photovoltaic ferroelectric, piezoelectric, or magneto electric capabilities, as well as in spintronics [10][11][12]. BiFeO 3 constitutes a most important material being a semiconductor with the absorption edge in the visible region, BiFeO 3 NPs have been successfully tested in the degradation of Rhodamine B, methyl orange, methylene blue and bisphenol-A [13][14][15] and its capacitance properties have been improved by metal oxide doping [16].…”