Crystal structures of rare earth elements rich apatite analogues
Abstract The crystal structures have been determined for britholite-(Ce) and lessingite-(Ce) from the type localities and a third sample (‘min X’) showing chemical similarities to both britholite-(Ce) and lessingite-(Ce). This sample is from the Ilímaussaq intrusion in Greenland. They are rare earth...
Published in: | Zeitschrift für Kristallographie - Crystalline Materials |
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Walter de Gruyter GmbH
1990
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crdegruyter:10.1524/zkri.1990.191.3-4.249 2023-05-15T16:29:32+02:00 Crystal structures of rare earth elements rich apatite analogues Kalsbeek, Nicoline Larsen, Sine Rønsbo, Jørn G. 1990 http://dx.doi.org/10.1524/zkri.1990.191.3-4.249 https://www.degruyter.com/document/doi/10.1524/zkri.1990.191.3-4.249/xml https://www.degruyter.com/document/doi/10.1524/zkri.1990.191.3-4.249/pdf en eng Walter de Gruyter GmbH Zeitschrift für Kristallographie - Crystalline Materials volume 191, issue 3-4, page 249-263 ISSN 2194-4946 2196-7105 Inorganic Chemistry Condensed Matter Physics General Materials Science journal-article 1990 crdegruyter https://doi.org/10.1524/zkri.1990.191.3-4.249 2022-04-14T05:01:29Z Abstract The crystal structures have been determined for britholite-(Ce) and lessingite-(Ce) from the type localities and a third sample (‘min X’) showing chemical similarities to both britholite-(Ce) and lessingite-(Ce). This sample is from the Ilímaussaq intrusion in Greenland. They are rare earth elements (REE) rich apatite analogues. Based on the X-ray diffraction results they were assigned to the hexagonal system with cell dimensions slightly larger than those of apatite. The three structures have been refined in the space group P 6 3 to R values: 0.033 [britholite-(Ce)], 0.039 [lessingite-(Ce)] and 0.036 (‘min X’). The site occupancy factors for the REE atoms are in good qualitative agreement with results from electron-microprobe analysis. The lowering of the space group symmetry relative to the apatite structure originates in differences in the oxygen positions. There is only analogy between one of the oxygen atoms of the SiO[unk]− and the oxygen atoms in apatite. The two REE sites found on threefold axis which correspond to Ca(1) in apatite are both nine-coordinated, but display significant variations in their REE—O distances. The REE found in a general position is seven-coordinated and similar to Ca(2) in apatite. Article in Journal/Newspaper Greenland De Gruyter (via Crossref) Greenland Zeitschrift für Kristallographie - Crystalline Materials 191 3-4 249 263 |
institution |
Open Polar |
collection |
De Gruyter (via Crossref) |
op_collection_id |
crdegruyter |
language |
English |
topic |
Inorganic Chemistry Condensed Matter Physics General Materials Science |
spellingShingle |
Inorganic Chemistry Condensed Matter Physics General Materials Science Crystal structures of rare earth elements rich apatite analogues |
topic_facet |
Inorganic Chemistry Condensed Matter Physics General Materials Science |
description |
Abstract The crystal structures have been determined for britholite-(Ce) and lessingite-(Ce) from the type localities and a third sample (‘min X’) showing chemical similarities to both britholite-(Ce) and lessingite-(Ce). This sample is from the Ilímaussaq intrusion in Greenland. They are rare earth elements (REE) rich apatite analogues. Based on the X-ray diffraction results they were assigned to the hexagonal system with cell dimensions slightly larger than those of apatite. The three structures have been refined in the space group P 6 3 to R values: 0.033 [britholite-(Ce)], 0.039 [lessingite-(Ce)] and 0.036 (‘min X’). The site occupancy factors for the REE atoms are in good qualitative agreement with results from electron-microprobe analysis. The lowering of the space group symmetry relative to the apatite structure originates in differences in the oxygen positions. There is only analogy between one of the oxygen atoms of the SiO[unk]− and the oxygen atoms in apatite. The two REE sites found on threefold axis which correspond to Ca(1) in apatite are both nine-coordinated, but display significant variations in their REE—O distances. The REE found in a general position is seven-coordinated and similar to Ca(2) in apatite. |
author2 |
Kalsbeek, Nicoline Larsen, Sine Rønsbo, Jørn G. |
format |
Article in Journal/Newspaper |
title |
Crystal structures of rare earth elements rich apatite analogues |
title_short |
Crystal structures of rare earth elements rich apatite analogues |
title_full |
Crystal structures of rare earth elements rich apatite analogues |
title_fullStr |
Crystal structures of rare earth elements rich apatite analogues |
title_full_unstemmed |
Crystal structures of rare earth elements rich apatite analogues |
title_sort |
crystal structures of rare earth elements rich apatite analogues |
publisher |
Walter de Gruyter GmbH |
publishDate |
1990 |
url |
http://dx.doi.org/10.1524/zkri.1990.191.3-4.249 https://www.degruyter.com/document/doi/10.1524/zkri.1990.191.3-4.249/xml https://www.degruyter.com/document/doi/10.1524/zkri.1990.191.3-4.249/pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Zeitschrift für Kristallographie - Crystalline Materials volume 191, issue 3-4, page 249-263 ISSN 2194-4946 2196-7105 |
op_doi |
https://doi.org/10.1524/zkri.1990.191.3-4.249 |
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Zeitschrift für Kristallographie - Crystalline Materials |
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191 |
container_issue |
3-4 |
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249 |
op_container_end_page |
263 |
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1766019236904304640 |