{
  "abstract": "CuBi 2 O 4 (kusachiite) spinel was successfully synthesized via a conventional solid-state reaction and confirmed by X-ray powder diffraction (XRD) to crystallize in a single-phase tetragonal structure (space group P4/nnc). Scanning electron microscopy (SEM) revealed a uniform microstructure with grain sizes around 5 μm. Dielectric measurements revealed a notable Negative Real Permittivity (NRP) behavior, with permittivity values reaching as low as ε' r = -8 × 10 4 at 653 K, transitioning to positive values at higher frequencies. A broad dielectric anomaly was observed at Tc = 553 K, indicating a phase-related transition. The activation energies derived from Arrhenius analysis of DC conductivity were 0.56 eV for T ≤ 553 K and 0.66 eV for T > 553 K. AC conductivity followed Jonscher's power law, with conduction mechanisms evolving from the correlated barrier hopping (CBH) model below 553 K to the non-small polaron tunneling (NSPT) model above this temperature. Nyquist plots showed distinct grain and grain boundary contributions below 573 K, modeled via a dual R-CPE equivalent circuit. At higher temperatures, an inductive component emerged, attributed to Cu-induced surface currents and negative ε'.These results demonstrate that CuBi 2 O 4 combines thermally activated mixed conduction with unique dielectric and inductive properties, making it a promising candidate for ENZ metamaterials, temperature-tunable plas-monic devices, and coil-free inductive components.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Yossr Gahmeri"
    },
    {
      "name": "Imen Gharbi"
    },
    {
      "name": "Mohamed Tliha"
    },
    {
      "name": "Obaidallah A Algethami"
    },
    {
      "name": "Jean-François Bardeau"
    },
    {
      "name": "Abderrazek Oueslati"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5f3epcbh9qak7.bib",
  "cited_by": 5,
  "doi": "10.1016/j.inoche.2025.115006",
  "fulltext_url": null,
  "id": "5f3epcbh9qak7",
  "issns": [
    "1387-7003"
  ],
  "landing_url": "https://cnrs.hal.science/hal-05784995v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "openalex",
      "2505|Dielectric properties of ceramics"
    ]
  ],
  "openalex": "W4412441918",
  "pdf_url": "https://cnrs.hal.science/hal-05784995/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/5f3epcbh9qak7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:50Z",
      "native_id": "hal-05784995",
      "source": "hal",
      "url": "https://cnrs.hal.science/hal-05784995v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Dielectric properties of ceramics",
      "subfield": "materials-polymers"
    }
  ],
  "title": "High-temperature Plasmonic behavior and negative permittivity in CuBi2O4: Structural, dielectric, and electrical insights",
  "title_text": "High-temperature Plasmonic behavior and negative permittivity in CuBi2O4: Structural, dielectric, and electrical insights",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:50Z",
  "url": "https://research.draconitic.com/paper/5f3epcbh9qak7",
  "venue": "Inorganic Chemistry Communications",
  "versions": []
}