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<p>Cobalt nickel titanate exhibits magnetic properties that vary depending on synthesis methods, doping, and cationic distribution. It can be weakly ferromagnetic at room temperatures, exhibiting spontaneous magnetization. The cationic distribution of cobalt nickel lanthanum titanate (Ni<sub>0,5</sub>Co<sub>0,5</sub>Ti<sub>(1−x)</sub>La<sub>x</sub>O<sub>3</sub>) with various values of x = 0.0, 0.025, 0.05 and 0.075 was investigated in this study. The solid-state reaction method was used to synthesize the samples using mechanical milling. A series of analytical techniques were utilized for the characterization of the material properties, including a X-ray Diffractometer (XRD), Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS), Vibrating Sample Magnetometer (VSM), and Vector Network Analyzer (VNA). XRD analysis revealed that a samples of x = 0.0 exhibited a single phase of (Co, Ni)TiO<sub>3</sub>, and for composition x &gt; 0 a second phase is found which is identified as the CoO phase. Dominant phase of the Ni<sub>0,5</sub>Co<sub>0,5</sub>Ti<sub>(1−x)</sub>La<sub>x</sub>O<sub>3</sub> perovskite samples (x = 0.0, 0.025, 0.05 and 0.075) have a hexagonal crystal structure with space group R<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\overline{3}\)</EquationSource> </InlineEquation> (148). The surface morphology produced by SEM has a uniform shape and the particle size of the doped sample appears smaller than the undoped sample (x = 0). Increasing the value of x gives a decrease in the magnetic saturation value from 0.083 emu/g (x = 0) to 0.065 emu/g (x = 0.75), while the value of the coercivity field increases from 220 Oe to 275.5 Oe, respective for x = 0 and x = 0.75. The presence of weak ferromagnetic in this sample is greatly influenced by the cationic distribution of each cation. The findings of the microwave absorption study in the frequency range of 4–8&#xa0;GHz (C-band) indicate that substituting La<sup>3+</sup> ions increase the microwave absorption ability but not too significant. This substitution increases the microwave attenuation, increasing the value from 93.01 to 95.82%. The analysis of the cationic distribution and its correlation with structural, magnetic properties and microwave absorption has been discussed in this paper.</p>

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Cationic distribution analysis of lanthanum doped Cobalt nickel titanate as microwave absorbing material and its correlation with weak ferromagnetic behavior

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Yunasfi Yunasfi,
  • Jan Setiawan,
  • Mashadi Mashadi,
  • Didin S. Winatapura,
  • Maya Puspitasari Izaak,
  • M. Rizky Ramdhani,
  • Dede Djuhana,
  • Wisnu Ari Adi,
  • Yohanes Edi Gunanto

摘要

Cobalt nickel titanate exhibits magnetic properties that vary depending on synthesis methods, doping, and cationic distribution. It can be weakly ferromagnetic at room temperatures, exhibiting spontaneous magnetization. The cationic distribution of cobalt nickel lanthanum titanate (Ni0,5Co0,5Ti(1−x)LaxO3) with various values of x = 0.0, 0.025, 0.05 and 0.075 was investigated in this study. The solid-state reaction method was used to synthesize the samples using mechanical milling. A series of analytical techniques were utilized for the characterization of the material properties, including a X-ray Diffractometer (XRD), Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS), Vibrating Sample Magnetometer (VSM), and Vector Network Analyzer (VNA). XRD analysis revealed that a samples of x = 0.0 exhibited a single phase of (Co, Ni)TiO3, and for composition x > 0 a second phase is found which is identified as the CoO phase. Dominant phase of the Ni0,5Co0,5Ti(1−x)LaxO3 perovskite samples (x = 0.0, 0.025, 0.05 and 0.075) have a hexagonal crystal structure with space group R \(\:\overline{3}\) (148). The surface morphology produced by SEM has a uniform shape and the particle size of the doped sample appears smaller than the undoped sample (x = 0). Increasing the value of x gives a decrease in the magnetic saturation value from 0.083 emu/g (x = 0) to 0.065 emu/g (x = 0.75), while the value of the coercivity field increases from 220 Oe to 275.5 Oe, respective for x = 0 and x = 0.75. The presence of weak ferromagnetic in this sample is greatly influenced by the cationic distribution of each cation. The findings of the microwave absorption study in the frequency range of 4–8 GHz (C-band) indicate that substituting La3+ ions increase the microwave absorption ability but not too significant. This substitution increases the microwave attenuation, increasing the value from 93.01 to 95.82%. The analysis of the cationic distribution and its correlation with structural, magnetic properties and microwave absorption has been discussed in this paper.