{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T04:06:45Z","timestamp":1781669205389,"version":"3.54.5"},"reference-count":28,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2023,2,18]],"date-time":"2023-02-18T00:00:00Z","timestamp":1676678400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Region Hauts-de-France","award":["0081-2022-0002"],"award-info":[{"award-number":["0081-2022-0002"]}]},{"name":"scientific task","award":["0081-2022-0002"],"award-info":[{"award-number":["0081-2022-0002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Numerous studies expose the potential of brannerite to become a good matrix, concentrating fission products and actinides. Minerals can complement the data collected from the synthetic materials and offer an advantage of a long-time exposure to radiation. Natural metamict brannerite from Akchatau, Kazakhstan, and its annealed sample were studied by EPMA, Raman spectroscopy, TGA, DSC, XRD and HTXRD. The radioactivity of pristine and annealed samples of brannerite was measured. Brannerite from Akchatau is characterized by the absence of significant amounts of REE and yttrium. The studied brannerite regains its structure at a temperature ~650 \u00b0C, revealed by the HTXRD and DSC. HTXRD was also performed on the annealed recrystallized brannerite. The thermal expansion for brannerite has been determined for the first time. The brannerite structure expands anisotropically with temperature increase. All the thermal expansion coefficients are positive except for \u03b1\u03b2. The decreasing beta parameter indicates a \u201cshear structural deformation\u201c. The angle between the 1st axis of the tensor and the crystallographic a axis decreases with the increase of the temperature. The structure expands mostly in the \u03b111 direction, approaching the bisector of the \u03b2 angle. Brannerite has a low CTE at room temperature\u2014\u03b1v = 16 \u00d7 10\u22126 \u00b0C\u22121, which increases up to 39.4 \u00d7 10\u22126 \u00b0C\u22121 at 1100 \u00b0C. In general, the thermal stability of brannerite is comparable to that of the other perspective oxide radioactive waste-immobilizing matrices (e.g., Ln2Zr2O7, CePO4, CaTiO3, CaZrTi2O7). The calculated thermal expansion of brannerite and the understanding of its underlying crystal chemical mechanisms may contribute to the behavior prediction of the material (both metamict and crystalline) at high temperatures.<\/jats:p>","DOI":"10.3390\/ma16041719","type":"journal-article","created":{"date-parts":[[2023,2,20]],"date-time":"2023-02-20T02:02:09Z","timestamp":1676858529000},"page":"1719","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Chemistry, Recrystallization and Thermal Expansion of Brannerite from Akchatau, Kazakhstan"],"prefix":"10.3390","volume":"16","author":[{"given":"Ruiqi","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, 199034 St. Petersburg, Russia"},{"name":"Universit\u00e9 Lille, CNRS, Centrale Lille, Universit\u00e9 Artois, UMR 8181, UCCS, Unit\u00e9 de Catalyse et Chimie du Solide, F-59000 Lille, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1908-3152","authenticated-orcid":false,"given":"Oleg I.","family":"Siidra","sequence":"additional","affiliation":[{"name":"Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, 199034 St. Petersburg, Russia"},{"name":"Institute of Silicate Chemistry, Russian Academy of Sciences, 199034 St. Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vera A.","family":"Firsova","sequence":"additional","affiliation":[{"name":"Institute of Silicate Chemistry, Russian Academy of Sciences, 199034 St. Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angel","family":"Arevalo-Lopez","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Lille, CNRS, Centrale Lille, Universit\u00e9 Artois, UMR 8181, UCCS, Unit\u00e9 de Catalyse et Chimie du Solide, F-59000 Lille, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marie","family":"Colmont","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Lille, CNRS, Centrale Lille, Universit\u00e9 Artois, UMR 8181, UCCS, Unit\u00e9 de Catalyse et Chimie du Solide, F-59000 Lille, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valery L.","family":"Ugolkov","sequence":"additional","affiliation":[{"name":"Institute of Silicate Chemistry, Russian Academy of Sciences, 199034 St. Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vladimir N.","family":"Bocharov","sequence":"additional","affiliation":[{"name":"Geomodel Resource Center, St. Petersburg State University, 199034 St. Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1016\/j.chemgeo.2011.09.008","article-title":"Chemistry, Microstructure, and Alpha Decay Damage of Natural Brannerite","volume":"291","author":"Lumpkin","year":"2012","journal-title":"Chem. 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