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 stoichio… Show more
“…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) …”
Lead-free perovskites are a class of promising optoelectronic materials that emerged recently as a nontoxic and stable alternative to lead halide perovskites. Herein, we report the growth and properties of a Cs 4 FeBiBr 10 single crystal, an example of a new-type A 4 BB′X 10 lead-free metal halide perovskite. High-quality single crystals were grown by a solution temperature-lowering method, and a needle shaped crystal with dimensions up to 4 mm × 1 mm × 1 mm was obtained. The black colored product crystallized in orthorhombic symmetry with Pnma space group as analyzed by single crystal XRD. The existence of Bi octahedra and Fe tetrahedra in the crystal lattice indicates the unique feature of the A 4 BB′X 10 perovskite. The Cs 4 FeBiBr 10 single crystals absorb light across the UV−visible region with an optical band gap of 1.62 eV. Temperature-dependent photoluminescence measurements indicate that the Cs 4 FeBiBr 10 single crystals show photoluminescence emission over a wide range of the spectrum covering UV, green, and red regions. The discovery of the new-type A 4 BB′X 10 family enriches the categories of lead-free perovskites and provides more choices of optically active materials for optoelectronic applications.
“…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) …”
Lead-free perovskites are a class of promising optoelectronic materials that emerged recently as a nontoxic and stable alternative to lead halide perovskites. Herein, we report the growth and properties of a Cs 4 FeBiBr 10 single crystal, an example of a new-type A 4 BB′X 10 lead-free metal halide perovskite. High-quality single crystals were grown by a solution temperature-lowering method, and a needle shaped crystal with dimensions up to 4 mm × 1 mm × 1 mm was obtained. The black colored product crystallized in orthorhombic symmetry with Pnma space group as analyzed by single crystal XRD. The existence of Bi octahedra and Fe tetrahedra in the crystal lattice indicates the unique feature of the A 4 BB′X 10 perovskite. The Cs 4 FeBiBr 10 single crystals absorb light across the UV−visible region with an optical band gap of 1.62 eV. Temperature-dependent photoluminescence measurements indicate that the Cs 4 FeBiBr 10 single crystals show photoluminescence emission over a wide range of the spectrum covering UV, green, and red regions. The discovery of the new-type A 4 BB′X 10 family enriches the categories of lead-free perovskites and provides more choices of optically active materials for optoelectronic applications.
“…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.…”
Section: Structural and Electronic Propertiesmentioning
Spintronics is an emerging technology in which electron spin carries information along with its charge. The current article reveals the ferromagnetic, optical, and thermoelectric properties of Z2FeTiO6 (Z = Mg, Zn) predicted using the first-principles calculations. Heisenberg's classical model and polarization density calculations ensure ferromagnetism above room temperature and 100% spin polarization. Besides, the nature of ferromagnetism has been addressed by s-d and p-d exchange splitting, double exchange model, exchange energies, crystal field energy, and exchange constants. Furthermore, the optical properties are elaborated by dielectric constant, refractive index, and absorption in which intra-band transitions are incorporated. Finally, the thermal transports of the materials are investigated in terms of electrical and thermal conductivities, Seebeck coefficient, and power factor.
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