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<p>A ceramic sample of (Sr<sub>0.90</sub>Ba<sub>0.10</sub>)(Mn<sub>0.50</sub>Nb<sub>0.50</sub>)O<sub>3</sub> was fabricated using the solid-state reaction method. X-ray diffraction (XRD) confirmed the pattern of a single-phase perovskite material. Scanning electron microscopy (SEM) showed that the grains were densely packed with little surface porosity. This analysis offered important insights into the relationships between structure and properties, as well as conduction mechanisms. The study emphasizes the role of interface effects, space charge polarization, and Maxwell–Wagner dielectric relaxation in achieving a high dielectric constant at low frequencies and elevated temperatures. Nyquist plots were used to investigate the effect of grain on the resistive and capacitive characteristics. The permittivity, impedance, modulus, and transport properties were significantly influenced by the frequency (1&#xa0;kHz–1&#xa0;MHz) of the applied field and temperature (25–275&#xa0;°C). The optical bandgap was determined to be 2.79&#xa0;eV, making it suitable for optoelectronic applications. Raman and FTIR analyses confirmed the presence of vibrational bands in the material. Temperature-dependent magnetization measurements (2–300&#xa0;K) were conducted under various magnetic fields in both zero-field-cooled (ZFC) and field-cooled (FC) modes. A weak antiferromagnetic transition was noted at 43&#xa0;K, but an unexpected increase in magnetization below this transition also suggests the emergence of weak ferromagnetism at low temperatures in this structure.</p>

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An Experimental Investigation of Structural, Dielectric, Magnetic, and Optical Properties of (Sr0.90Ba0.10)(Mn0.50Nb0.50)O3 Perovskite for High Frequency and Optoelectronic Applications

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Srikanta Behera,
  • Raj Mohan Mohanty,
  • Raj Kishore Mishra,
  • Sabyasachi Parida,
  • Tapan Dash,
  • Abhishek Sahoo,
  • Asmin Kar

摘要

A ceramic sample of (Sr0.90Ba0.10)(Mn0.50Nb0.50)O3 was fabricated using the solid-state reaction method. X-ray diffraction (XRD) confirmed the pattern of a single-phase perovskite material. Scanning electron microscopy (SEM) showed that the grains were densely packed with little surface porosity. This analysis offered important insights into the relationships between structure and properties, as well as conduction mechanisms. The study emphasizes the role of interface effects, space charge polarization, and Maxwell–Wagner dielectric relaxation in achieving a high dielectric constant at low frequencies and elevated temperatures. Nyquist plots were used to investigate the effect of grain on the resistive and capacitive characteristics. The permittivity, impedance, modulus, and transport properties were significantly influenced by the frequency (1 kHz–1 MHz) of the applied field and temperature (25–275 °C). The optical bandgap was determined to be 2.79 eV, making it suitable for optoelectronic applications. Raman and FTIR analyses confirmed the presence of vibrational bands in the material. Temperature-dependent magnetization measurements (2–300 K) were conducted under various magnetic fields in both zero-field-cooled (ZFC) and field-cooled (FC) modes. A weak antiferromagnetic transition was noted at 43 K, but an unexpected increase in magnetization below this transition also suggests the emergence of weak ferromagnetism at low temperatures in this structure.