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<p>Sol-gel synthesized Zn<sub>0.1</sub>Co<sub>0.9</sub>Fe<sub>2</sub>O<sub>4</sub> was characterized extensively for its structural, magnetic, and optical and dielectric properties in terahertz frequencies. X-ray diffractometry confirmed the pure cubic spinel phase (space group: Fd-3&#xa0;m). Rietveld analysis in consonance with the room temperature <sup>57</sup>Fe- Mössbauer data confirmed the inverse spinel structure. Field and temperature dependent magnetization revealed typical ferrimagnetic behaviour with a decent saturation magnetization of 88 emu/g. Terahertz time-domain spectrum in frequency range of 0.3–2.0 THz demonstrated a nearly constant refractive index ~ 2.95 and a low extinction coefficient, indicative of weak absorption and minimal dielectric loss. The real part of the complex dielectric permittivity exhibited remarkable stability (~ 8.94), while the imaginary part displayed negligible dispersion across the measured frequency range. These results demonstrate that low-level Zn substitution effectively tailors the electromagnetic response of cobalt ferrite, positioning Zn<sub>0.1</sub>Co<sub>0.9</sub>Fe<sub>2</sub>O<sub>4</sub> as a promising candidate for high-frequency applications.</p>

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Structural, Magnetic and Terahertz Optical and Dielectric Properties of Zn0.1Co0.9Fe2O4

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Ganesh Pawar,
  • Amitkumar Pandey,
  • Sarang Joshi,
  • J.P. Parvathy,
  • N. S. Warade,
  • P. B. Mane,
  • Sher Singh Meena,
  • Sudeep Tiwari,
  • S. S. Prabhu

摘要

Sol-gel synthesized Zn0.1Co0.9Fe2O4 was characterized extensively for its structural, magnetic, and optical and dielectric properties in terahertz frequencies. X-ray diffractometry confirmed the pure cubic spinel phase (space group: Fd-3 m). Rietveld analysis in consonance with the room temperature 57Fe- Mössbauer data confirmed the inverse spinel structure. Field and temperature dependent magnetization revealed typical ferrimagnetic behaviour with a decent saturation magnetization of 88 emu/g. Terahertz time-domain spectrum in frequency range of 0.3–2.0 THz demonstrated a nearly constant refractive index ~ 2.95 and a low extinction coefficient, indicative of weak absorption and minimal dielectric loss. The real part of the complex dielectric permittivity exhibited remarkable stability (~ 8.94), while the imaginary part displayed negligible dispersion across the measured frequency range. These results demonstrate that low-level Zn substitution effectively tailors the electromagnetic response of cobalt ferrite, positioning Zn0.1Co0.9Fe2O4 as a promising candidate for high-frequency applications.