THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY
The activities of the NaAlSi2O6 and KAlSi2O6 components in this system have been determined at 1150o-1530oC. Mixing is close to ideal despite dissimilar crystal structures; this may reflect a re-organization of the melt in Na-rich compositions to give NaAlSiO4-like and SiO2-like constituents nearer...
| Principais autores: | , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
1983
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| _version_ | 1826285963207245824 |
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| author | Fraser, D Rammensee, W Jones, R |
| author_facet | Fraser, D Rammensee, W Jones, R |
| author_sort | Fraser, D |
| collection | OXFORD |
| description | The activities of the NaAlSi2O6 and KAlSi2O6 components in this system have been determined at 1150o-1530oC. Mixing is close to ideal despite dissimilar crystal structures; this may reflect a re-organization of the melt in Na-rich compositions to give NaAlSiO4-like and SiO2-like constituents nearer the cage structure of nepheline than the chain structure of jadeite and with Al in tetrahedral rather than octahedral coordination. The partial molar heats and excess entropies of mixing show a pronounced minimum at Na:K = 3:1 which compares closely with the normal composition of nepheline. This may be an example of a more general phenomenon, in which liquids tend to approximate the structure of the crystalline phase stable on the liquidus at the particular composition, rather than that of a mineral having the same composition as the melt.-R.A.H. |
| first_indexed | 2024-03-07T01:36:43Z |
| format | Journal article |
| id | oxford-uuid:957191fb-0e1e-40d0-aa53-bb7a66d98eb1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:36:43Z |
| publishDate | 1983 |
| record_format | dspace |
| spelling | oxford-uuid:957191fb-0e1e-40d0-aa53-bb7a66d98eb12022-03-26T23:46:11ZTHE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRYJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:957191fb-0e1e-40d0-aa53-bb7a66d98eb1EnglishSymplectic Elements at Oxford1983Fraser, DRammensee, WJones, RThe activities of the NaAlSi2O6 and KAlSi2O6 components in this system have been determined at 1150o-1530oC. Mixing is close to ideal despite dissimilar crystal structures; this may reflect a re-organization of the melt in Na-rich compositions to give NaAlSiO4-like and SiO2-like constituents nearer the cage structure of nepheline than the chain structure of jadeite and with Al in tetrahedral rather than octahedral coordination. The partial molar heats and excess entropies of mixing show a pronounced minimum at Na:K = 3:1 which compares closely with the normal composition of nepheline. This may be an example of a more general phenomenon, in which liquids tend to approximate the structure of the crystalline phase stable on the liquidus at the particular composition, rather than that of a mineral having the same composition as the melt.-R.A.H. |
| spellingShingle | Fraser, D Rammensee, W Jones, R THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title | THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title_full | THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title_fullStr | THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title_full_unstemmed | THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title_short | THE MIXING PROPERTIES OF MELTS IN THE SYSTEM NAALSI2O6-KALSI2O6 DETERMINED BY KNUDSEN CELL MASS-SPECTROMETRY |
| title_sort | mixing properties of melts in the system naalsi2o6 kalsi2o6 determined by knudsen cell mass spectrometry |
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