{
  "abstract": "We systematically investigated the phase stability and pressure dependence of the elastic properties of four GeO2 polymorphs: rutile-, CaCl2-, alpha-PbO2-, and pyrite-type phases using theoretical calculations based on density functional theory. The elastic constants were calculated at 5 GPa intervals within the respective stability ranges of the four phases, as determined from static enthalpy calculations. We further employed a classical strain-coupled Landau free-energy expansion to describe the pressure evolution of the elastic response associated with the rutile- to CaCl2-type transition and to elucidate the origin of the elastic softening near the transition. The rutile- to CaCl2-type phase transition is consistent with a Landau-type second-order transition, with a critical pressure of 14.6 GPa obtained from the strain-based analysis. As the transition pressure approaches, elastic softening develops in the rutile-type phase, resulting in anomalous pressure dependence of the bulk and shear modulus. The calculated elastic-wave anisotropy increases markedly near the transition, primarily due to the rapid reduction in shear-wave velocity, reaching a maximum of approximately 122% at 22.5 GPa. Following the transition, the anisotropy decreases sharply in the CaCl2-type phase and exhibits a discontinuity at the CaCl2-type/alpha-PbO2 -type phase boundary. The higher-pressure alpha-PbO2- and pyrite-type phases exhibit comparatively weak pressure dependence of anisotropy, with a small discontinuity at their respective phase transition boundaries. The pyrite-type phase has the lowest anisotropy, reaching only approximately 4-5% at high pressure, consistent with the high-symmetry cubic structure and nearly isotropic elastic-wave propagation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.09469",
  "author_total": 4,
  "authors": [
    {
      "name": "Gulshan Kumar"
    },
    {
      "name": "Sumit Ghosh"
    },
    {
      "name": "Sharad Babu Pillai"
    },
    {
      "name": "Rajkrishna Dutta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/42yztse14htkv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.09469",
  "fulltext_url": null,
  "id": "42yztse14htkv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.09469",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.09469",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/42yztse14htkv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.09469",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09469"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "High-pressure elastic properties of GeO2 polymorphs up to 120 GPa",
  "title_text": "High-pressure elastic properties of GeO2 polymorphs up to 120 GPa",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:34Z",
  "url": "https://research.draconitic.com/paper/42yztse14htkv",
  "venue": "arXiv",
  "versions": []
}