EFFECT OF NEUTRON IRRADIATION ON VACANCY EVOLUTION IN NANOCRYSTALLINE B4C PARTICLES
Jale G. Atakishiyeva
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ABSTRACT

Nanocrystalline boron carbide (B4C) particles were irradiated with neutrons up to a fluence of 2×1017 n·cm-2 and studied by X-band ESR spectroscopy. In the unirradiated sample only a very weak, broad background signal is detected, indicating a low initial concentration of paramagnetic centers. After neutron irradiation, an intense, broadened resonance line with an effective g ≈ 2.0 appears, and its intensity increases markedly with fluence. This behaviour is attributed to the efficient generation of vacancy-type and bond-related centers in the B–C atomic lattice.

Keywords: Nanocrystal B4C; neutron radiation; EPR spectroscopy.
DOI:10.70784/azip.2.2025428

Received: 08.12.2025
Internet publishing: 09.12.2025    AJP Fizika A 2025 04 az p.28-31

AUTHORS & AFFILIATIONS

Ministry of Science and Education of the Republic of Azerbaijan, Institute of Radiation Problems, 9 B.Vahabzade, Baku, AZ 1143, Azerbaijan
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 [1]   P. Gokul et al. "Development of boron carbide concrete for enhanced radiation shielding in nuclear reactors" Case Studies in Construction Materials 22, 2025, e04354.
[2]   C. Dominguez et al. "Investigation on boron carbide oxidation for nuclear reactor safety: Experiments in highly oxidising conditions" Journal of Nuclear Materials 374, 2008, 473–481.
[3]   Fatemeh Soltanifar et al. "Defect Recovery and Functional Property Enhancement of Gamma-Irradiated Boron Carbide Nanopowders for Nuclear Applications" Journal of Nuclear Materials 2025, 156357.
[4]   I. Erkoyuncu et al. "An evaluation of gamma and neutron shielding features of concrete reinforced with stainless steel/boron carbide: Experimental, theoretical analysis and Monte Carlo simulations approaches" Radiation Physics and Chemistry 239, 2026, 113249.
[5]   N. Ramli et al. "Modified ultra-high-performance concrete with boron carbide for neutron and gamma radiation shielding" Construction and Building Materials 467, 2025, 140421.
[6]   Shiwei Xu et al. "Boron carbide nanoparticles for boron neutron capture therapy" RSC Advances 15, 2025, 10717–10730.
[7]   M. Dejangah et al. "Polymer-based tungsten/lead-boron carbide composites for dual-mode photon and neutron shielding in LINACs" Radiation Physics and Chemistry 238, 2026, 113185.
[8]   Elchin M. Huseynov, Jale G. Atakishiyeva. "Characterizing neutron irradiation-induced effects in the nanocrystalline B4C particles using EPR spectroscopy" Solid State Sciences 154, 107604, 2024.
[9]   Elchin M. Huseynov, Anze Jazbec."Application of neutron transmutation technology to control the physical properties of nanoparticles at the atomic scale" Carbon 229, 119568, 2024.
[10]  Elchin M. Huseynov."FTIR spectroscopy of ZrC nanoparticles under the gamma radiation" Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 286, 122032, 2023.
[11]  Elchin M. Huseynov. "Modulation of conductivity in neutron-irradiated nanocrystalline β-SiC through trace and dopant elements" Journal of Electronic Materials 54, 2025, 8920–8934.
[12]  Elchin M. Huseynov, Tural G. Naghiyev. "Low temperature DSC investigation of neutron irradiated non-crystalline Si3N4 nanoparticles" Journal of Non-Crystalline Solids 647, 2025, 123272.
[13]  M. Kakazey et al. "X-ray and EPR study of reactions between B4C and TiO2" Materials Science and Engineering: A 418, 2006, 111–114.
[14]  Hui Jiang et al. "Investigation of defects in sputtered W/B4C multilayers" Applied Surface Science 357, Part A, 2015, 1180–1186.
[15]  N. Djourelov et al. "Effect of the defects on Li diffusion in irradiated B4C" Research Section B: Beam Interactions with Materials and Atoms 570, 2026, 165953.
[16]  Zhipeng Huo et al. "Microstructure regulatable PbWO4 fillers reinforced B4C/HDPE composites for synergistic radiation shielding of neutron and gamma-ray" Composites Part A: Applied Science and Manufacturing 197, 2025, 109011.
[17]  Haroon Rashid et al. "Air-plasma sprayed Al-B4C composite coating for advanced radiation shielding" Journal of Alloys and Compounds Communications 7, 2025, 100103.