Thermal Stability of Nanocrystalline Sm₂O₃ and Sm₂O₃–MgO

Abstract

Nanocrystalline Sm2O3 and Sm2O3–MgO powders have been prepared by spray pyrolysis of aqueous precursor solutions containing citric acid as a complexant. Synthesized powders consist of hollow spheres with thin shells. The two‐phase samples exhibit an improved microstructural stability compared with pure Sm2O3. The microstructure before and after various heat treatments has been investigated by high‐resolution transmission electron microscopy, scanning electron microscopy, nitrogen adsorption, and X‐ray diffraction.

Sm2O3 nanoparticles green synthesis via Callistemon viminalis' extract

“…(i) by heating the emulsions obtained after synthesis at 200, 300, 400 and 500 °C respectively XRD suggests that the onset of crystallization does not begin until ~500 °C before which the Sm2O3 thin films produced are amorphous, (ii) when compared to the several literature results and in particular the XRD reference profile reported by Sieger et al [24], the onset of crystallization for Sm2O3 produced by biosynthesis begins at a lower temperature, (iii) compared to the existing literature, the average particle size of the Sm2O3 nanoparticles produced by biosynthesis also tends to be far smaller than that of particles reported in the literature [27][28][29][30][31][32]. …”

“…In that light, Sm2O3 meso-and nanostructures with different shapes; nanoparticles/nanospheres, nanowires, nanoroll sticks, nanorods, nanoplatelets and nanofibres [13][14][15][16][17][18] have been prepared using a variety of physical and chemical process methodologies such as sputtering, laser-induced deposition, thermal decomposition, high vacuum nanocasting using mesoporous silica as templates, hydrogen plasma-assisted growth, soft-chemistry based processes, sol-gel synthesis using different chemical precursors, spray pyrolysis, hydrothermal synthesis, electrospinning and microwave synthesis [19][20][21][22][23][24][25][26].…”

Synthesis and characterization of nanoparticulate films for intermediate temperature solid oxide fuel cells

“…The temperature of the filter was held above 100°C in order to suppress water condensation. A vacuum pump and an automatically operated reducing valve were used to maintain total pressure within the system at 0.9 atm [20]. The powder was synthesized at temperatures of 800, 1000, 1100 and 1200°C.…”

Multicomponent equiatomic rare earth oxides

“…The nanocrystalline multicomponent REO powders were synthesized by employing nebulized spray pyrolysis (NSP) instead of solid-state reactions as done in previous publications. [1,9] This well-established method [10][11][12][13][14][15] allows for the direct synthesis of nanocrystalline powders in a short period of time (production rate of 1-2 g h −1 in a laboratory scale reactor) with a homogeneous distribution of the elements inside the crystal lattice. The crystal structure and the elemental compositions of assynthesized and subsequently heat-treated REO powders are discussed and the phase stability upon heat treatments is addressed.…”