Effects of Molar Ratios and Sintering Times on Crystal Structures and Surface Morphology of Nd_1+xFeO₃ Oxide Alloy Prepared by using Solid Reaction Method

Abstract

Abstract. The effects of molar ratios and sintering times on crystal structures and surface morphology on NdFeO3 oxide alloy have been studied. NdFeO3 oxide alloy formed by chemical preparation with solid reaction method using raw oxide Fe2O3 (99.9 %) and Nd2O3 (99.9 %) powders. In this article we reported the effects of molar ratios x = (-0.1, -0.2 and -0.3) and sintering times for 15 h and 20 h on crystal structures and surface morphology of Nd1+xFeO3 synthesized by solid-state reaction method. The results indicate that variation of molar ratio and sintering time has influenced the FWHM, crystalline size and grain size. The Nd1+xFeO3 have a major phase is NdFeO3, and other minor phases are Fe2O3, Nd2O3 and Nd(OH)3. The dominant intensity of hkl (121) with a value in FWHM, crystallite size, and grain size an indication the results will be applied as a gas sensor material as the focus of the further study.

Characterization and Inhibitory Effects of Magnetic Iron Oxide Nanoparticles Synthesized from Plant Extracts on HeLa Cells

“…The result is similar to the crystallite size obtained in this work for Fe 3 O 4 NPs extracted with lower molar ratios of Fe 3+ /Fe 2+ (1.4 : 1). An appreciable decrease in the crystallite size is observed when the molar ratio of the precursors is increased to a high malar ratio (2.8 : 1) and the observation is in line with works reported in literature [ 32 , 33 ]. The high molar ratio prevents good agglomeration of the crystallites and thus decreases the size.…”

“…The absorption peaks at ∼2921 cm −1 and 2845 cm −1 are associated with the sp3 C–H stretching vibrations of the –CH 2 functional group [ 31 ]. The peak at ∼1637 cm −1 represents N-H bending of amide group and the peak at ∼1036 cm −1 corresponds to C-N stretching of aliphatic amines [ 32 ]. It is also observed in Figure 1 that the strength of absorption or intensity is stronger for the plantain peels than the maize leaves indicating that the phytochemicals identified are rich in the plantain peels compared to the maize leaves.…”

“…The peak current indicates that ML3-FeNPs proliferate through depolarization whereas ML1-Fe 3 O 4 NPs proliferate through polarization. Cellular activities with cancerous cells are usual with depolarization [ 32 ]. Thus, polarization signal obtained suggests inhibition of cancerous proliferation.…”

Synthesis of ytterbium-doped neodymium ferrite oxide using solid-state reaction method and its characterization

“…The Yb doped NdFeO 3 sample was synthesized using the best parameters found by previous research [18][19][20][21][22][23]. Raw materials of Nd 2 O 3 (Strem Chemicals, 99.99%), Yb 2 O 3 (Sigma-Aldrich, 99.99%) and Fe 2 O 3 (Sigma-Aldrich, 99.99%) were mixed according to stoichiometric calculation and grinded using mortar for 3 h. That mixed material then calcined using the furnace at temperature 700 C for 4 h. After that, the temperature increased to 950 °C by keeping the temperature constant for 2 h. The heating then decreased to 475 °C and kept it continued for 2 h. After this thermal process, the material was grinded for 6 h.…”