Effect of Ce Doping on the Structure and Chemical Stability of Nano-α-Fe2O3

Abstract

Ce-doped nano-α-Fe2O3 was successfully synthesized via the hydrothermal method. The properties of the prepared particles were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and electrochemical methods. It was found that the Ce element can be doped into the α-Fe2O3 lattice resulting in lattice distortion, which can refine the grain and improve the crystal surface’s integrity significantly. In addition, doping of Ce element can shorten the Fe–O bond length in the α-Fe2O3 crystal, cause a blue shift of the stretching vibration band, enhance binding energy of Fe–O and the chemical stability of the α-Fe2O3 crystal.

Investigating the role of bentonite clay with different soil amendments to minimize the bioaccumulation of heavy metals in Solanum melongena L. under the irrigation of tannery wastewater

“…Scanning electron micrographs and particle size distributions of the prepared FOP and CFOP nanoparticles are shown in Figures 1Ba–d , 2 . Agglomeration of nanoparticles can be seen in both FOP and CFOP, with an average particle size of 308 and 419 nm, respectively ( Ning et al, 2019 ).…”

Design of Hydrothermally Derived Fe2O3 Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

“…Aligned one-dimensional binary oxide semiconductors on various substrates have attracted a lot of attention due to their potential applications in photocatalysts, photoelectrochemical (PEC) electrodes, and gas sensors. − Hematite (α-Fe 2 O 3 ) is gaining importance in photoactivated device and gas sensor applications because it is an n-type semiconductor, low cost, highly chemically and thermally stable, and nontoxic. − Recently, one-dimensional hematite-based nanomaterials have been fabricated by employing various synthesis routes such as a hydrothermal method with a calcination process, , solvothermal route with the assistance of ionic liquid, and thermal oxidation of iron foil . Among these synthesis routes, the hydrothermal method is an effective and low-cost method to produce a large and uniform aligned hematite nanorods with a desirable crystalline quality on various substrates.…”

“…Moreover, the limited potential barrier numbers in the crystalline one-dimensional α-Fe 2 O 3 rods also hinder their gas-sensing response upon exposure to various target gases . To overcome the abovementioned drawbacks, surface treatment and impurity doping of the hematite have been explored to enhance its electronic and optical properties. ,, However, the surface treatment of the hematite crystals limits degrees of freedom in tuning their functionality, and effective doping with a desirable concentration in the hematite crystals is hard to be controlled during the hydrothermal growth because of their low reaction temperature. Due to peculiar properties that originated from their individual phases, composite or heterogeneous materials are a promising approach to design the hematite-based rods with enhanced and desirable functionalities .…”

Phase equilibria in the CaO-La2O3-Nb2O5system at 1823, 1773, and 1673 K

“…The CaO-La 2 O 3 -Nb 2 O 5 system is one of the subsystems of the complex multicomponents system, the phase equilibria in this ternary system is the basis of subsequent phase diagram study. In addition, the phase diagram of CaO-La 2 O 3 -Nb 2 O 5 system is also helpful for the application of Nb and RE in the related materials, such as thermoelectric materials, ceramic materials, and steel materials [15][16][17][18][19]. However, only the isothermal section at 1553 K was determined until now [11].…”