{
  "abstract": "Natural sanidine commonly preserves metastable chemical disorder at ambient conditions, but the local structural correlations associated with this disorder remain poorly understood due to a reliance on average-structure analysis alone. Here, we investigate single-crystal diffuse scattering in a natural sanidine from Drachenfels, Germany, with consistent observations across additional samples from Laacher See, Germany, and Vesuvio, Italy. The diffraction data reveal pronounced anisotropic diffuse features, including characteristic bowtie-like intensity distributions in reciprocal space. To resolve the origin of these features, we combine three-dimensional difference pair distribution function (3D-$Δ$PDF) analysis with force-field calculations and Monte Carlo modelling. The 3D-$Δ$PDF shows correlated deviations from the average structure and indicates a strong coupling between occupational and displacive disorder. Force-field calculations demonstrate that the aluminosilicate framework responds strongly to the local alkali occupancy, with the largest structural variation occurring along the $a$ direction. Guided by these observations, we construct a disorder model in which K/Na occupational short-range order is combined with chemically constrained Al/Si distributions and local framework relaxations. The model reproduces the main experimental diffuse-scattering features and shows that the bowtie-like diffuse scattering arises from correlated framework distortions driven primarily by local K/Na order.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.29899",
  "author_total": 3,
  "authors": [
    {
      "name": "Christin Wiggers"
    },
    {
      "name": "Daniel A. Chaney"
    },
    {
      "name": "Ella M. Schmidt"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2kxjp0p3cdfmk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.29899",
  "fulltext_url": null,
  "id": "2kxjp0p3cdfmk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.29899",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.other"
    ],
    [
      "openalex",
      "2505|X-ray Diffraction in Crystallography"
    ]
  ],
  "openalex": "W7214286617",
  "pdf_url": "https://arxiv.org/pdf/2609.29899",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2kxjp0p3cdfmk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2609.29899",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.29899"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Local order in natural sanidine disentangled via single crystal diffuse scattering",
  "title_text": "Local order in natural sanidine disentangled via single crystal diffuse scattering",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/2kxjp0p3cdfmk",
  "venue": "arXiv",
  "versions": []
}