首页> 外文OA文献 >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
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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

机译:Pr3 +取代对通过溶胶-凝胶法合成的Ni0.5Zn0.5PrxFe2-xO4纳米粒子的微观结构,比表面积,磁性和比加热速率的影响

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摘要

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.
机译:通过溶胶-凝胶法合成了一系列标称成分为Ni0.5Zn0.5PrxFe2-xO4(x = 0.000-0.100,步长为0.025)的Ni-Zn铁氧体纳米粒子。研究了组成和煅烧温度对形态,比表面积,磁性能和比加热速率的影响。 Ni-Zn-Pr铁氧体在Pr含量低于5 at%时具有单尖晶石(NZF)相。在Ni-Zn-Pr铁氧体中,当Pr含量高于5 at%时,存在少量的正交晶PrFeO3相。 Pr含量为10 at%时,比表面积与未掺杂的Ni0.5Zn0.5Fe2O4样品相比增加了六倍。随着Pr负载的增加,饱和磁化强度,剩余磁化强度和矫顽力增加,并在x = 0.05时达到最大值,然后下降。这些参数的最大值分别为67.0 emu / g,9.7 emu / g和87.2 Oe。在射频场(频率:295 kHz,强度:500 Oe)下,样品的最高加热速率为1.65 K / s,x = 0.025,比Ni0.5Zn0.5Fe2O4高2.5倍。

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