'Synthesis of Co1-xGdxFe2O4+d (0 ≥ x ≤ 0.1) and study of their magnetic, electric, and magneto-optical properties'
| Autor: | C. Mallada, Sagrario M. Montemayor, J.A. Díaz-Guillén, José Luis Menéndez, Rebeca Betancourt-Galindo, O.S. Rodríguez-Fernández, Noé Vázquez |
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| Přispěvatelé: | Gobierno del Estado de Coahuila, Centro de Investigación en Química Aplicada (México) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Coprecipitation Electrical properties (C) Analytical chemistry chemistry.chemical_element 02 engineering and technology Thermal treatment 010402 general chemistry 01 natural sciences Magnetization Nuclear magnetic resonance Ferrimagnetism Phase (matter) Materials Chemistry Magnetic properties (C) Spinels (D) Gd doped ferrites (D) Process Chemistry and Technology Coercivity 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Ceramics and Composites Crystallite 0210 nano-technology Cobalt |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | In this investigation, pure and gadolinium-doped cobalt ferrites (Co1−xGdxFe2O4+δ, x= 0, 0.02, 0.04, 0.06, 0.08 y 0.1), were synthesized through a modified route of the coprecipitation method. X-ray diffraction technique shows a cubic phase of the spinel-type structure typically associated with these compounds. According to Scherrer's equation, the crystallite size can be tuned through the Gd3+ content (26 nm to x= 0 and 9 nm to x= 0.1) or through the temperature of the thermal treatment (21 nm to 400 °C and 28 nm to 700 °C). The obtained powders show a ferrimagnetic behavior, at room temperature, with magnetization (reached at the maximum applied field) and coercivity values showing a dependence on the substitution grade of cobalt (II) by gadolinium (III) ions. At x= 0.02 the magnetization shows an increase of 7% (even when the particle size decreases a 40%) and the coercivity shows a decrease of 45%. DC conductivity of sintered ferrites is enhanced up to 3 orders of magnitude in the x= 0.1 substituted materials; while, keeping a constant transverse magneto-optical Kerr effect around 0.35%. This investigation was supported by Centro de Investigación en Química Aplicada through the internal projects 6238 and 6311. Noé Vázquez thanks to CIQA and Gobierno del Estado de Coahuila for the scholarship received. |
| Databáze: | OpenAIRE |
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