{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T20:30:51Z","timestamp":1786653051766,"version":"build-2736575974"},"reference-count":28,"publisher":"International Union of Crystallography (IUCr)","issue":"5","license":[{"start":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T00:00:00Z","timestamp":1759104000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T00:00:00Z","timestamp":1759104000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"funder":[{"name":"state assignment of IGM SB RAS","award":["122041400176-0"],"award-info":[{"award-number":["122041400176-0"]}]}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr B Struct Sci Cryst Eng Mater","Acta Crystallogr B","Acta Crystallogr B Struct Sci","Acta Cryst B","Acta Cryst B Struct Sci Cryst Eng Mater","Acta Cryst Sect B","Acta Cryst Sect B Struct Sci Cryst Eng Mater","Acta Crystallogr Sect B","Acta Crystallogr Sect B Struct Sci Cryst Eng Mater","Acta Crystallogr Sect B Struct Sci"],"accepted":{"date-parts":[[2025,9,5]]},"published-print":{"date-parts":[[2025,10,1]]},"abstract":"<jats:p>\n                    K\n                    <jats:sub>8<\/jats:sub>\n                    Ca\n                    <jats:sub>3<\/jats:sub>\n                    (CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>7<\/jats:sub>\n                    was synthesized at 1200\u00b0C and 6\u2005GPa. Its layered triclinic crystal structure presents a new type characteristic of high-pressure K\u2013Ca carbonates. It is also the second example of K\/Ca disorder coupled with orientational disorder of carbonate anions. Descriptions based on the most symmetric (tri\/hexagonal) and the densest (\n                    <jats:italic>krd<\/jats:italic>\n                    -type) cation\u2013carbon nets reveal its peculiarities and common features with the crystal structures of chemically related carbonates. The four-layered\n                    <jats:italic>ABA<\/jats:italic>\n                    \u2032\n                    <jats:italic>B<\/jats:italic>\n                    packing in K\n                    <jats:sub>8<\/jats:sub>\n                    Ca\n                    <jats:sub>3<\/jats:sub>\n                    (CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>7<\/jats:sub>\n                    is based on hexagonal cation nets, wherein carbon atoms occupy two types of positions. Most of the carbon atoms are localized close to net\n                    <jats:italic>B<\/jats:italic>\n                    , within the centers of triangular loops. This forms a b\u00fctschliite layer, which is found in other alkali-bearing carbonates and is composed of alkali cations. Its presence in the K\n                    <jats:sub>8<\/jats:sub>\n                    Ca\n                    <jats:sub>3<\/jats:sub>\n                    (CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>7<\/jats:sub>\n                    crystal structure implies that the K\/Ca disorder is incomplete. In nets\n                    <jats:italic>A<\/jats:italic>\n                    and\n                    <jats:italic>A<\/jats:italic>\n                    \u2032, carbon atoms replace the cations at some nodes, resulting in the aggregation and increased concentration of carbon atoms and their stronger mixing with cations in the densest (\n                    <jats:italic>krd<\/jats:italic>\n                    -type) nets. Thus, a new type of densest mixed net is formed in the K\n                    <jats:sub>8<\/jats:sub>\n                    Ca\n                    <jats:sub>3<\/jats:sub>\n                    (CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>7<\/jats:sub>\n                    crystal structure. A quantitative measure of the packing density of high-pressure K\u2013Ca carbonates is the reticular density of the symmetric atomic nets, as well as the distance between the densest nets.\n                  <\/jats:p>","DOI":"10.1107\/s2052520625007929","type":"journal-article","created":{"date-parts":[[2025,9,25]],"date-time":"2025-09-25T14:53:12Z","timestamp":1758811992000},"page":"466-472","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Novel dense crystal structure of high-pressure synthetic K\n                    <sub>8<\/sub>\n                    Ca\n                    <sub>3<\/sub>\n                    (CO\n                    <sub>3<\/sub>\n                    )\n                    <sub>7<\/sub>\n                    as described through cation\u2013carbon nets"],"prefix":"10.1107","volume":"81","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6785-4508","authenticated-orcid":true,"given":"Anna Yu.","family":"Likhacheva","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2936-0694","authenticated-orcid":true,"given":"Sergey V.","family":"Rashchenko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark A.","family":"Ignatov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandr V.","family":"Romanenko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anton F.","family":"Shatsky","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2025,9,29]]},"reference":[{"key":"yh5043_bb1","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1007\/s00269-018-1000-z","volume":"46","author":"Arefiev","year":"2019","journal-title":"Phys. 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