SOLUBILITY OF NIOBIUM IN THE SYSTEM CACO3-CA(OH)2-NANBO3 AT 0.1 GPA PRESSURE
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dc.contributor.author | Mitchell R.H. | |
dc.contributor.author | Kjarsgaard B.A. | |
dc.date.accessioned | 2021-09-19T06:11:12Z | |
dc.date.available | 2021-09-19T06:11:12Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1372722 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2002, 144, 1, 93-97 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30333 | |
dc.description.abstract | Experimental data are presented for the solubility of NaNbO3 in the ternary system CaCO3-Ca(OH)2-NaNbO3 (or calcite-portlandite-lueshite) over the temperature range 500-950 °C at 0.1 GPa pressure. Near-liquidus phase relationships are given for the pseudo-binary join ([CaCO3]45[Ca(OH)2]55)100-x-(NaNbO3)x; (0 <x <70 wt%). these data show the presence of a large field calcite plus liquid and absence nanbo3 as a primary liquidus phase until the melts contain greater than 60 wt% NaNbO3. The primary crystallization fields of calcite and NaNbO3 are separated by a steep thermal valley located at about 55 wt% NaNbO3. Quenched liquids contain calcite, portlandite, sodium carbonates and perovskite-structured calcium niobates. The maximum solubility of Nb2O5 in this system is estimated to be on the order of 48 wt% at 650 °C at 0.1 GPa pressure. The experiments show that perovskite-structured compounds rather than pyrochlore crystallize from these fluorine-free, water-rich melts. | |
dc.title | SOLUBILITY OF NIOBIUM IN THE SYSTEM CACO3-CA(OH)2-NANBO3 AT 0.1 GPA PRESSURE | |
dc.type | Статья |
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