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3 results for “Neodymium orthoferrite”
Effect of B-site co-substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion
<p><span>Samples of cobalt-doped neodymium orthoferrite compounds, NdCo<sub>x</sub>Fe<sub>1-x</sub>O<sub>3</sub> (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 – 300 °C and calcined at 500 °C for two hours. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and Scanning Electron Microscopy showed that the particles were spherical and in the nano-sized range (19 – 52 nm) with pores between grains. Vibrating sample magnetometry at room temperature indicated that NdFeO<sub>3</sub> has high coercive field (1950 Oe) and cobalt substitution for iron led to a decrease in the coercive field, saturation and remanent magnetization which was as a result of decreased magnetic moments in the crystal and reduced canting of the FeO<sub>6</sub> octahedra. The increase in magnetization and coercive fields with increase Co was connected to the microstructure (bond lengths and angles, defects, pores, grain boundaries) and crystallite size. The compounds NdCo<sub>x</sub>Fe<sub>1-x</sub>O<sub>3</sub> show antiferromagnetism with weak ferromagnetism due to uncompensated noncollinear moments. These compounds could serve as prototypes for tuning the properties of magnetic materials (ferromagnetic and antiferromagnetic) with potential applications in data storage, logic gates, switches and sensors. </span></p>
Effect of B-site co-substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion
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Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion
Samples of cobalt-doped neodymium orthoferrite compounds, NdCoxFe1-xO3 (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 – 300 °C and calcined at 500 °C for two hours. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and Scanning Electron Microscopy showed that the particles were spherical and in the nano-sized range (19 – 52 nm). Vibrating sample magnetometry indicated that nonmagnetic Co3+ ions produced magnetic vacancies which led to a decrease in magnetization. Results also showed that coercive fields of the doped samples were lower than the undoped and generally increased with cobalt doping, attaining a maximum value of 601 Oe for NdCo0.4Fe0.6O3. By introducing magnetic vacancies, these compounds could serve as prototypes for tuning the properties of magnetic materials (ferromagnetic and antiferromagnetic) with potential applications in data storage, logic gates, switches, and sensors.
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