Effect of salt species on characterization of Bi3NbTiO9 powders prepared by molten salt method

Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

“…2a, the GFO synthesized at 600°C exhibited characteristic obvious orthorhombic perovskite crystal structure belonging to space group Pbnm [34]. Particular, the diffraction peaks at 2θ = 23.2°, 26.09°, 32.2°, 33.2°, 33.8°, 34.38°m atched well with the (002), (111), (020), (112), ( 200) and (021) planes of orthorhombic structure (Pbnm space group) [32]. The distinct diffraction pattern indicates the good crystallinity which is also in good agreement with the standard JCPDS 78-0451, and other previously published literatures [34][35][36][37].…”

“…As comparison, the R3c GFO has a rhombohedral unit cell which is organized in a three-dimensional lattice, with the Gd and Fe ions and oxygen atoms situated at the lattice points [32]. The oxygen atoms in octahedral FeO 6 form chains along the z directions and occupy tetrahedral voids in the lattice.…”

“…The transition is driven by the competition between the exchange interaction and the crystal eld interaction in GdFeO 3 , which is sensitive to the crystal symmetry [27]. In GFO, the A-site polyhedron GdO 12 expands more rapidly versus temperature than the B-site and FeO 6 sites [32], thus stabilizing the R3c phase at higher temperature. The distortion of crystal structure and the tilting of the FeO 6 octahedra break the cubic symmetry and increase the polarizability of structure.…”

The influences of possible factors on preparation and characterization of Lu2Ti2O7 nano-wires

“…Molten salt synthesis (MSS) is a well established low temperature synthesis technique that has recently attracted increasing interest. The molten salt method has some features such as simple, versatile and cost effective, which is appropriate for the synthesis of crystalline, chemically purified, single phase nanostructures [7][8][9][10]. Lutetium titanium oxide (Lu 2 Ti 2 O 7 ) has a pyrochlore structure and is particularly suitable for application in an optical imaging system due to it's high refractive index and high density.…”

Investigation into La(Fe/Mn)O3 Perovskites Formation over Time during Molten Salt Synthesis

“…Molten salt synthesis (MSS) is an alternative method for synthesis of complex oxides. − Since the molten salt acts as a solvent in which PTO formation occurs, MSS provides additional tunable parameters to exert control over product particle morphology. − The salt composition − and the salt/reagent ratio − are known to affect the size and shape of MSS product particles. However, despite the significant body of literature on tuning MSS product properties and its use in synthesis of new complex oxides, little is known about the mechanisms and kinetics of MSS. , Generally, only the final product is isolated and characterized, with proposed explanations of the post-synthesis results relying on a mechanism involving dissolution of reagents, reaction of dissolved species, nucleation of product particles and their subsequent growth. − This nucleation and growth mechanism is well established for particle formation in aqueous and organic solutions, ,− showing that the particle size and shape are determined by the nucleation and growth rates. − Tuning the synthesis conditions affects these rates, granting control over the product particle morphology. − However, examination of these rates for MSS is currently lacking, as studying its kinetics necessitates tracking the particle morphology, which was never performed.…”