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<p>Single phase double perovskite oxide Dy<sub>2</sub>NiMnO<sub>6</sub> was synthesized using sol-gel process. Structural studies reveal monoclinic phase with space group <i>P2</i><sub><i>1</i></sub><i>/n</i>. Two strong Raman modes are observed due to bending and stretching motions of (Ni/MnO<sub>6</sub>) octahedra. Morphology of sample is studied with FE-SEM and the average particle size is found to be 352&#xa0;nm. The atomic ratio of Ni and Mn is found to be ~ 1, it validates the desired stoichiometry of sample. A direct optical narrow energy band gap of 1.37&#xa0;eV is estimated from Tauc relation. Giant saturation magnetization of 15.93 µ<sub>B</sub>/formula unit is obtained at 5K. Temperature dependent magnetic study show ferromagnetic characteristic with T<sub>c</sub> = 98&#xa0;K. Colossal dielectric constant of the order of 10<sup>5</sup> is found at room temperature. The typical dielectric relaxation is observed from high value of dielectric constant (10<sup>5</sup> at 100&#xa0;Hz) to lower value (20 at 1&#xa0;MHz). The simultaneous existence of colossal dielectric constant and giant magnetization may be utilized for futuristic magneto-dielectric devices.</p>

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Occurrence of colossal dielectric constant and giant magnetism in Dy2NiMnO6 double perovskite oxide

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Vishwajit M. Gaikwad,
  • Shraddha C. Shirbhate

摘要

Single phase double perovskite oxide Dy2NiMnO6 was synthesized using sol-gel process. Structural studies reveal monoclinic phase with space group P21/n. Two strong Raman modes are observed due to bending and stretching motions of (Ni/MnO6) octahedra. Morphology of sample is studied with FE-SEM and the average particle size is found to be 352 nm. The atomic ratio of Ni and Mn is found to be ~ 1, it validates the desired stoichiometry of sample. A direct optical narrow energy band gap of 1.37 eV is estimated from Tauc relation. Giant saturation magnetization of 15.93 µB/formula unit is obtained at 5K. Temperature dependent magnetic study show ferromagnetic characteristic with Tc = 98 K. Colossal dielectric constant of the order of 105 is found at room temperature. The typical dielectric relaxation is observed from high value of dielectric constant (105 at 100 Hz) to lower value (20 at 1 MHz). The simultaneous existence of colossal dielectric constant and giant magnetization may be utilized for futuristic magneto-dielectric devices.