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<p>In this study, pure polyvinyl alcohol (PVA) and nanocomposites of PVA/B<sub>4</sub>C/x wt% SrFe<sub>12</sub>O<sub>19</sub> (x = 2.5, 5, 7.5, and 10 wt%) were fabricated. The structural, morphological, elemental, magnetic, and radiation shielding properties of the samples were systematically investigated using XRD, SEM, EDX, VSM, and the NXCom and BXCOM computational tools. XRD confirmed the formation of single-phase hexagonal SrFe<sub>12</sub>O<sub>19</sub> and rhombohedral B<sub>4</sub>C. EDX mapping revealed homogeneous dispersion of B<sub>4</sub>C and SFO within the PVA matrix. The M–H loops demonstrated ferromagnetic behavior in both pure SFO and the nanocomposites. The saturation magnetization (M<sub>s</sub>) showed an increment in nanocomposites with magnetic content SFO. The coercivity H<sub>c</sub> established enhancement from 1265.3 Oe for pure SFO to 2360.8 Oe for 10 wt%, where pure SFO showed a negative exchange bias, while all composites exhibited positive bias values. Gamma ray shielding performance was assessed through MAC, LAC, Z<sub>eff</sub>, N<sub>eff</sub>, HVL, and MFP calculations, with SFO-rich samples showing superior attenuation, supported by a distinct K-edge near 0.0161&#xa0;MeV. Samples S1–S5 exhibited fast neutron removal cross-section values of 0.1642–0.1805&#xa0;cm<sup>−1</sup>, confirming that the combined presence of B<sub>4</sub>C and increasing SFO content significantly enhances the fast neutron attenuation capability of the composites. Overall, the results demonstrate that the developed nanocomposites are strong candidates for lightweight, multifunctional radiation shielding materials suitable for nuclear, medical, and aerospace applications.</p>

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Comprehensive Study of the Structural, Magnetic, and Shielding Characteristics of PVA–Based B4C Nanocomposites Reinforced with xSrFe12O19

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Ahmed M. El-Khayatt,
  • A. M. Reda,
  • A. A. Azab,
  • Essam M. Abdel-Fattah

摘要

In this study, pure polyvinyl alcohol (PVA) and nanocomposites of PVA/B4C/x wt% SrFe12O19 (x = 2.5, 5, 7.5, and 10 wt%) were fabricated. The structural, morphological, elemental, magnetic, and radiation shielding properties of the samples were systematically investigated using XRD, SEM, EDX, VSM, and the NXCom and BXCOM computational tools. XRD confirmed the formation of single-phase hexagonal SrFe12O19 and rhombohedral B4C. EDX mapping revealed homogeneous dispersion of B4C and SFO within the PVA matrix. The M–H loops demonstrated ferromagnetic behavior in both pure SFO and the nanocomposites. The saturation magnetization (Ms) showed an increment in nanocomposites with magnetic content SFO. The coercivity Hc established enhancement from 1265.3 Oe for pure SFO to 2360.8 Oe for 10 wt%, where pure SFO showed a negative exchange bias, while all composites exhibited positive bias values. Gamma ray shielding performance was assessed through MAC, LAC, Zeff, Neff, HVL, and MFP calculations, with SFO-rich samples showing superior attenuation, supported by a distinct K-edge near 0.0161 MeV. Samples S1–S5 exhibited fast neutron removal cross-section values of 0.1642–0.1805 cm−1, confirming that the combined presence of B4C and increasing SFO content significantly enhances the fast neutron attenuation capability of the composites. Overall, the results demonstrate that the developed nanocomposites are strong candidates for lightweight, multifunctional radiation shielding materials suitable for nuclear, medical, and aerospace applications.