{
  "abstract": "Melting of corundum (α-Al2O3) has been studied under compression up to 8 GPa using in situ electrical resistivity measurements. The melting temperature increases monotonically from T0 = 2317 K at ambient pressure to 3090 K at 7.7 GPa. Fitting the experimental data to the Simon-Glatzel equation yields the empirical parameters a = 5.60 GPa and c = 0.334, providing a closed-form analytical description of the entire melting boundary. Most significantly, the melting slope, dTm/dp, decreases continuously from 138 K/GPa at ambient pressure down to 78 K/GPa at 7.7 GPa, confirming unequivocal negative curvature of the melting curve (d2Tm/dp2 < 0). This phenomenon is consistent with the preferential densification of the liquid phase and the associated reduction in the volume change upon melting as pressure rises. These findings provide a robust empirical standard for the high-pressure melting of corundum, establishing essential constraints for future ab initio simulations, thermodynamic databases, and geophysical models of alumina-rich deep-Earth systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.19229",
  "author_total": 1,
  "authors": [
    {
      "name": "Vladimir L. Solozhenko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/15vgw22r9kqdp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.19229",
  "fulltext_url": null,
  "id": "15vgw22r9kqdp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.19229",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "1908|High-pressure geophysics and materials"
    ]
  ],
  "openalex": "W7213589859",
  "pdf_url": "https://arxiv.org/pdf/2609.19229",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/15vgw22r9kqdp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.19229",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.19229"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Melting of corundum (α-Al2O3) under compression to 8 GPa: A decreasing melting slope",
  "title_text": "Melting of corundum (α-Al2O3) under compression to 8 GPa: A decreasing melting slope",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/15vgw22r9kqdp",
  "venue": "arXiv",
  "versions": []
}