Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry.
The entropies, enthalpies and free energies of mixing of melts in the system NaAlSiO4-KAlSiO4-SiO2 were determined by Knudsen cell mass spectrometry (KCMS). The enthalpies of mixing have an accuracy and precision (1 - sigma ) of approx 1.0 and 0.5 kJ/mol, respectively (M.A. 86M/0442) and are thus co...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Journal article |
| Language: | English |
| Published: |
Geochemical Society, Special Publication 1
1987
|
| _version_ | 1826272931955605504 |
|---|---|
| author | Fraser, D Rammensee, W |
| author2 | Mysen, B |
| author_facet | Mysen, B Fraser, D Rammensee, W |
| author_sort | Fraser, D |
| collection | OXFORD |
| description | The entropies, enthalpies and free energies of mixing of melts in the system NaAlSiO4-KAlSiO4-SiO2 were determined by Knudsen cell mass spectrometry (KCMS). The enthalpies of mixing have an accuracy and precision (1 - sigma ) of approx 1.0 and 0.5 kJ/mol, respectively (M.A. 86M/0442) and are thus comparable to the best solution calorimetric data available for glasses. The mixing properties of the melts are related to the topology of the underlying liquidus surface, so that marked changes in the entropy, enthalpy and free energy of mixing of the melts accompany changes in the nature of the crystalline phase in equilibrium with the melt at lower T. These data and the results of XRD, NMR and Raman spectroscopic studies of glass of similar composition, indicate that clustering may occur in the melts to produce regions which differ in structure and composition on the 20 A scale. The equilibrium liquids are thus inhomogeneous on the micro-scale and may contain structures more closely related to the crystalline phase on the liquidus than to a mineral phase of the same composition as the liquid. (Authors' abstract)-J.M.H. |
| first_indexed | 2024-03-06T22:20:22Z |
| format | Journal article |
| id | oxford-uuid:54d7060b-a397-46a1-b621-d4c3ffe21627 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:20:22Z |
| publishDate | 1987 |
| publisher | Geochemical Society, Special Publication 1 |
| record_format | dspace |
| spelling | oxford-uuid:54d7060b-a397-46a1-b621-d4c3ffe216272022-03-26T16:40:13ZDetermination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:54d7060b-a397-46a1-b621-d4c3ffe21627EnglishSymplectic Elements at OxfordGeochemical Society, Special Publication 11987Fraser, DRammensee, WMysen, BThe entropies, enthalpies and free energies of mixing of melts in the system NaAlSiO4-KAlSiO4-SiO2 were determined by Knudsen cell mass spectrometry (KCMS). The enthalpies of mixing have an accuracy and precision (1 - sigma ) of approx 1.0 and 0.5 kJ/mol, respectively (M.A. 86M/0442) and are thus comparable to the best solution calorimetric data available for glasses. The mixing properties of the melts are related to the topology of the underlying liquidus surface, so that marked changes in the entropy, enthalpy and free energy of mixing of the melts accompany changes in the nature of the crystalline phase in equilibrium with the melt at lower T. These data and the results of XRD, NMR and Raman spectroscopic studies of glass of similar composition, indicate that clustering may occur in the melts to produce regions which differ in structure and composition on the 20 A scale. The equilibrium liquids are thus inhomogeneous on the micro-scale and may contain structures more closely related to the crystalline phase on the liquidus than to a mineral phase of the same composition as the liquid. (Authors' abstract)-J.M.H. |
| spellingShingle | Fraser, D Rammensee, W Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title | Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title_full | Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title_fullStr | Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title_full_unstemmed | Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title_short | Determination of the mixing properties of granitic and other aluminosilicate melts by Knudsen cell mass spectrometry. |
| title_sort | determination of the mixing properties of granitic and other aluminosilicate melts by knudsen cell mass spectrometry |
| work_keys_str_mv | AT fraserd determinationofthemixingpropertiesofgraniticandotheraluminosilicatemeltsbyknudsencellmassspectrometry AT rammenseew determinationofthemixingpropertiesofgraniticandotheraluminosilicatemeltsbyknudsencellmassspectrometry |