Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Abstract

Autocombustion of citric acid gel was employed to prepare ReFeO 3 (Re = Gd, Nd) nanocrystalline powders. The phase identification and lattice parameters were investigated by the X-ray diffraction (XRD). Fieldemission scanning electron microscopy (FESEM) investigations were carried out to examine the morphology and average size of these powders. Several one phonon lines, two-magnon excitation, and two-phonon scattering have been assigned in their Raman spectra. Both NdFeO 3 and GdFeO 3 nanocrystalline powders were single ReFeO 3 phase, which are agglomerated with average crystallite size of 70-90 nm. The investigations indicated that the autocombustion of citric acid gel method is an effective technology to prepare ReFeO 3 nanocrystalline powders. 

Effect of Sintering Temperature on Crystal Structure and Surface Morphology of NdFeO₃ Oxide Alloy Materials Prepared by Solid Reaction Method

“…The highest intensity and FWHM value obtained the best quality of the crystalline structure is for sample #1 this is related with the intensity of 984.56 counts and 0.11˚. This result is similar with reference had reported [1,5,6,[10][11][12][13][14][15], although the sample prepared using a different method.…”

Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

“…36 A weak diffraction band located between 30 • and 40 • , similar to the one observed in the present patterns, was accordingly reported for amorphous Ba hexaferrite 37 and similar bands, centred at 2θ angles slightly larger than 30 • , were also found in other iron-based amorphous oxides. 38,39 This could support the hypothesis of a Sr-rich ironbased glassy phase as a result of the rapid cooling of the residual melt in the present coatings.…”

Doping effects on structural and magnetic evolutions of orthoferrite SmFe (1− x ) Al x O 3

“…The rare-earth (RE) orthoferrite REFeO 3 that normally crystallizes into a distorted orthorhombic structure with space group Pbnm is a derivative of cubic perovskite. [1] Attributed to the unique physical and chemical properties, these compounds with a perovskite structure are promising for a variety of potential applications such as catalysts, gas separators, cathodes of solid oxide fuel cells, sensor materials, magneto-optic materials, spin valves, etc. [2][3][4][5][6][7][8][9][10][11] SmFeO 3 , as one of RE orthoferrites, has attracted much attention due to its remarkable physical properties like high dielectric constant of 10 4 at room temperature, high T N temperature (T N = 674 K), and spontaneous magnetization reversal at cryogenic temperatures.…”