Effect of Pr3+ substitution on the microstructure, specific surface area, magnetic properties and specific heating rate of Ni0.5Zn0.5PrxFe2−xO4 nanoparticles synthesized via sol–gel method
| Autor: | Pengzhao Gao, Hang-bo Zheng, Zhou-li Lu, Rui-xue Ma, Bing Yan, Ying-xia Gao, Evgeny V. Rebrov |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Mechanical Engineering TK Spinel Metals and Alloys Analytical chemistry Coercivity engineering.material Microstructure Magnetization Nuclear magnetic resonance Mechanics of Materials Specific surface area Phase (matter) Dielectric heating Materials Chemistry engineering Orthorhombic crystal system QC |
| ISSN: | 0925-8388 |
| Popis: | A series of Ni–Zn ferrite nanoparticles with a nominal composition of Ni0.5Zn0.5PrxFe2−xO4 (x = 0.000–0.100 with steps of 0.025) has been synthesized by a sol–gel method. The effect of composition and calcination temperature on the morphology, specific surface area, magnetic properties and specific heating rate has been studied. The Ni–Zn–Pr ferrites have a single spinel (NZF) phase at Pr loadings below 5 at%. A minor amount of an orthorhombic PrFeO3 phase is present in the Ni–Zn–Pr ferrites at Pr loadings above 5 at%. At a Pr loading of 10 at%, the specific surface area increases six-fold as compared to that of the non-doped Ni0.5Zn0.5Fe2O4 sample. As the Pr loading increases, the saturation magnetization, remnant magnetization and coercivity increase and reach the maximum at x = 0.05 and then decrease. The maximum values of these parameters are 67.0 emu/g, 9.7 emu/g and 87.2 Oe, respectively. Under radiofrequency field (frequency: 295 kHz, intensity: 500 Oe), the highest heating rate of 1.65 K/s was observed over the sample with x = 0.025 which is 2.5 times higher than that of Ni0.5Zn0.5Fe2O4. |
| Databáze: | OpenAIRE |
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