{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T14:49:39Z","timestamp":1780325379837,"version":"3.54.1"},"reference-count":11,"publisher":"International Union of Crystallography (IUCr)","issue":"2","license":[{"start":{"date-parts":[[2016,1,20]],"date-time":"2016-01-20T00:00:00Z","timestamp":1453248000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"},{"start":{"date-parts":[[2016,1,20]],"date-time":"2016-01-20T00:00:00Z","timestamp":1453248000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr E Cryst Commun","Acta Cryst E","Acta Cryst Sect E","Acta Crystallogr E","Acta Crystallogr Sect E","Acta Cryst E Cryst Commun","Acta Cryst Sect E Cryst Commun"],"published-print":{"date-parts":[[2016,2,1]]},"abstract":"<jats:p>The title compound, Ca<jats:sub>2+<jats:italic>x<\/jats:italic><\/jats:sub>Nd<jats:sub>8\u2013<jats:italic>x<\/jats:italic><\/jats:sub>(SiO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>O<jats:sub>2\u20130.5<jats:italic>x<\/jats:italic><\/jats:sub>(<jats:italic>x<\/jats:italic>= 0.49), was synthesized at 1873\u2005K and rapidly quenched to room temperature. Its structure has been determined using single-crystal X-ray diffraction and compared with results reported using neutron and X-ray powder diffraction from samples prepared by slow cooling. The single-crystal structure from room temperature data was found to belong to the space group<jats:italic>P<\/jats:italic>6<jats:sub>3<\/jats:sub>\/<jats:italic>m<\/jats:italic>and has the composition Ca<jats:sub>2.49<\/jats:sub>Nd<jats:sub>7.51<\/jats:sub>(SiO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>O<jats:sub>1.75<\/jats:sub>[dicalcium octaneodymium hexakis(orthosilicate) dioxide], being isotypic with natural apatite and the previously reported Ca<jats:sub>2<\/jats:sub>Nd<jats:sub>8<\/jats:sub>(SiO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>O<jats:sub>2<\/jats:sub>and Ca<jats:sub>2.2<\/jats:sub>Nd<jats:sub>7.8<\/jats:sub>(SiO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>O<jats:sub>1.9<\/jats:sub>. The solubility limit of calcium in the equilibrium state at 1873\u2005K was found to occur at a composition of Ca<jats:sub>2+<jats:italic>x<\/jats:italic><\/jats:sub>Nd<jats:sub>8\u2013<jats:italic>x<\/jats:italic><\/jats:sub>(SiO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>O<jats:sub>2\u20130.5<jats:italic>x<\/jats:italic><\/jats:sub>, where<jats:italic>x<\/jats:italic>= 0.49.<\/jats:p>","DOI":"10.1107\/s205698901600089x","type":"journal-article","created":{"date-parts":[[2016,1,19]],"date-time":"2016-01-19T09:46:06Z","timestamp":1453196766000},"page":"209-211","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":7,"title":["Crystal structure of apatite type Ca<sub>2.49<\/sub>Nd<sub>7.51<\/sub>(SiO<sub>4<\/sub>)<sub>6<\/sub>O<sub>1.75<\/sub>"],"prefix":"10.1107","volume":"72","author":[{"given":"Thu Hoai","family":"Le","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neil R.","family":"Brooks","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koen","family":"Binnemans","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bart","family":"Blanpain","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Muxing","family":"Guo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luc","family":"Van Meervelt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2016,1,20]]},"reference":[{"key":"ru2066_bb1","unstructured":"Agilent (2012). 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