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Evaluation of electrical, dielectric and magnetic characteristics of Al-La doped nickel spinel ferrites

机译：Al-La掺杂镍尖晶石铁氧体的电，电介质和磁特性评估

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摘要

The paper reports the effects of lanthanum and aluminum ions, on the structural, electrical and magnetic properties of NiFe2O4 spinel ferrite nanoparticles. The precursors have been synthesized via a hydrothermal route in the presence of ascorbic acid (AA) using urea as a reducing agent and fuel for maintaining the uniform morphology and equal particle size distribution. In order to find out the optimum temperature (1023 K) for the formation of the spinel phase of the doped nickel ferrite, thermogravimetric analysis (TGA) for the un-annealed samples was performed. The X-ray diffraction patterns show that NiFe2 2xAlxLaxO4 have been well crystallized to spinel ferrite crystal structure with the Fd3m space group. The average crystallite size obtained is in the range of 9-19 nm, a size useful for attaining a suitable signal-to-noise ratio in high-density recording media and in electrical devices. In order to render the synthesized samples for diminishing eddy current losses, we were able to enhance the room temperature resistivity through proper selection of dopant used. The dielectric constant and dielectric loss decreased with applied frequency for all the samples showing normal behavior of ferrites. The calculated magnetic parameters such as saturation magnetization (M-s), remanence (M-r) and coercivity (H-c), showed increased values for some Al-La doped samples.
机译：本文报道镧和铝离子的影响，对镍铁尖晶石铁素体的纳米颗粒的结构，电性能和磁性能。前体已经经由使用尿素作为用于维持均一的形态和等于颗粒尺寸分布的还原剂和燃料抗坏血酸（AA）存在下进行水热路线被合成。为了找出掺杂镍铁素体的尖晶石相的形成最适宜的温度（1023 K），进行对未退火样品的热重分析（TGA）。的X射线衍射图案显示NiFe2 2xAlxLaxO4已经很好结晶，尖晶石铁氧体晶体结构与Fd3m的空间群。所获得的平均微晶尺寸为9-19纳米，尺寸为实现在高密度记录介质并在电气设备的适当信噪比有用的范围内。为了使为减少涡流损耗的合成的样品，我们可以通过使用掺杂剂的适当选择，以提高室温电阻率。介电常数和介电损耗随施加频率为表示铁氧体的正常行为的所有样品降低。所计算出的磁参数，诸如饱和磁化强度（M-S），剩磁（M-R）和矫顽力（H-c）中，显示增加对一些铝的La掺杂的值的样本。

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  • 来源
    《RSC Advances》 |2016年第8期|共9页
  • 作者

    Aziz Hafiz Sartaj; Rasheed Saadia; Khan Rafaqat Ali; Rahim Abdur; Nisar Jan; Shah Syed Mujtaba; Iqbal Farasat; Khan Abdur Rahman;

  • 作者单位

    COMSATS Inst Informat Technol Dept Chem Appl &

    Analyt Chem Lab Abbottabad Khyber Pakhtunk Pakistan;

    COMSATS Inst Informat Technol Dept Chem Appl &

    Analyt Chem Lab Abbottabad Khyber Pakhtunk Pakistan;

    COMSATS Inst Informat Technol Dept Chem Appl &

    Analyt Chem Lab Abbottabad Khyber Pakhtunk Pakistan;

    COMSATS Inst Informat Technol Interdisciplinary Res Ctr Biomed Mat Lahore Pakistan;

    Univ Peshawar Natl Ctr Excellence Phys Chem Khyber Pakhtunkhwa Pakistan;

    Quaid I Azam Univ Dept Chem Islamabad 45320 Pakistan;

    COMSATS Inst Informat Technol Interdisciplinary Res Ctr Biomed Mat Lahore Pakistan;

    COMSATS Inst Informat Technol Dept Chem Appl &

    Analyt Chem Lab Abbottabad Khyber Pakhtunk Pakistan;

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  • 正文语种 eng
  • 中图分类 化学;
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