X-RAY DIFFRACTION STUDY OF BRABANTITE-MONAZITE SOLID SOLUTIONS
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dc.contributor.author | Montel J.M. | |
dc.contributor.author | Devidal J.L. | |
dc.contributor.author | Avignant D. | |
dc.date.accessioned | 2021-09-18T04:59:40Z | |
dc.date.available | 2021-09-18T04:59:40Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1265836 | |
dc.identifier.citation | Chemical Geology, 2002, 191, 1-3, 89-104 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30304 | |
dc.description.abstract | We synthesized compounds with stoichiometry of natural brabantite M2+Th(PO4)2 with M2+=Ca, Cd, Sr, Pb, Ba at 1 bar, 1200 °C and 2.5 kbar, 700 °C. Those compounds were studied by powder X-ray diffraction and electron microprobe. For Ca, Sr, and Pb, we obtained always crystals with the monazite structure. For Cd, the monazite structure is obtained at 1 bar, but not at 2.5 kbar. For Ba, we obtained the monazite structure only at 2.5 kbar. The unit-cell parameters of the compounds with monazite structure vary regularly with the size of the M2+ ion. We studied also the solid-solution LaPO4-M2+Th(PO4)2, at 1200 °C, 1 bar. The solid solutions for Cd, Ca, and Sr are continuous, and the unit-cell parameters vary linearly with the degree of substitution. For Pb, the solid solution is continuous, but the unit-cell parameters do not vary linearly. For Ba, there is a miscibility gap, with a maximum of about 50 mol% of BaTh(PO4)2 in LaPO4. These results have several consequences for U-Th-Pb geochronology of monazite, and for utilization of monazite as a nuclear-waste ceramic. | |
dc.subject | MONAZITE | |
dc.subject | BRABANTITE | |
dc.subject | X-RAY DIFFRACTION | |
dc.subject | GEOCHRONOLOGY | |
dc.subject | NUCLEAR WASTE | |
dc.title | X-RAY DIFFRACTION STUDY OF BRABANTITE-MONAZITE SOLID SOLUTIONS | |
dc.type | Статья |
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