Structure and Physical Properties of the LaBiFe2O6 Perovskite Produced by the Modified Pechini Method

Abstract

In this paper the synthesis of the LaBiFe 2 O 6 material by the modified Pechini method is reported. Structural, morphologic, magnetic and optic experimental studies were performed. Rietveld refinement of x-ray diffraction patterns revealed that LaBiFe 2 O 6 crystallizes in an orthorhombic perovskite structure (space group Pnma, # 62). Scanning electron microscopy images showed the nanometric feature of grains. X-ray dispersive spectroscopy permitted to infer the obtaining of the LaBiFe 2 O 6 expected stoichiometry. Results of magnetic susceptibility as a function of temperature and field magnetization evidenced mixed ferromagnetism and superparamagnetism behavior at T=300 K. Mössbauer spectroscopy supported the superparamagnetic and ferromagnetic responses as a result of the nanogranular morphology and anisotropy effects. Spectrum of diffuse reflectance suggest that this material behaves as a semiconductor with energy gap E g =2.13 eV.

Cs4FeBiBr10: An Example of a New-Type A4BB′X10 Lead-Free Metal Halide Perovskite Single Crystal

“…The powder pattern of Cs 4 FeBiBr 10 corresponds to the orthorhombic system and space group Pnma . It has structural similarity with the oxide-based perovskite LaBiFe 2 O 6 and pnictide (AE 3 TrPn 3 , AE = Sr, Ba; Tr = Al, Ga; Pn = P, As) …”

First-principles study of ferromagnetic, optical, and transport properties of double Perovskites Z2FeTiO6 (Z = Mg, Zn)

“…The crystal structures of Z 2 FeTiO 6 with space group Pnma have been presented in figure 1, which shows the bonding among Mg/Zn, Ti, Fe, and O atoms. The computed lattice constants for Mg 2 FeTiO 6 are a=9.57Å, c=13.76Å, and for Zn 2 FeTiO 6 are a=9.55Å, c=13.65Å, which ensure the lattice constants decrease by the replacement of Mg with Zn because bonding forces increases [33]. The reported bulk modulus and pressure derivatives for Mg 2 FeTiO 6 are 202.95 Gpa and 4.69 Gpa, while for Zn 2 FeTiO 6, the bulk modulus and pressure derivatives are 166.95 Gpa and 3.61 Gpa.…”