Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F
The heat capacity of cryolite (Na3AlF6) has been measured from 7 to 1000 K by low-temperature adiabatic and high-temperature differential scanning calorimetry. Low-temperature data were obtained on material from the same hand specimen in the calorimetric laboratories of the University of Michigan an...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hdl.handle.net/2027.42/26500 http://www.sciencedirect.com/science/article/B6V66-48C8KHX-17K/2/d1dfd64912af39f1b4c71ad5e9b36552 https://doi.org/10.1016/0016-7037(87)90120-7 |
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/26500 2023-08-20T04:06:56+02:00 Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F Anovitz, Lawrence M. Hemingway, Bruce S. Westrum, Jr. , Edgar F. Metz, Guy W. Essene, Eric J. Department of Chemistry, Univ. of Michigan, Ann, Arbor, MI 48109, U.S.A. Department of Geological Sciences, Univ. of Michigan, Ann Arbor, MI 48109, U.S.A. Department of Geosciences, Univ. of Arizona, Tucson, AZ 85721, U.S.A.; Department of Geological Sciences, Univ. of Michigan, Ann Arbor, MI 48109, U.S.A. U.S. Geological Survey, 959 National Center, Reston, VA 22092, U.S.A. 1987-12 90230 bytes 3118 bytes 2298907 bytes text/plain application/pdf https://hdl.handle.net/2027.42/26500 http://www.sciencedirect.com/science/article/B6V66-48C8KHX-17K/2/d1dfd64912af39f1b4c71ad5e9b36552 https://doi.org/10.1016/0016-7037(87)90120-7 en_US eng Elsevier Anovitz, Lawrence M., Hemingway, Bruce S., Westrum, Jr., Edgar F., Metz, Guy W., Essene, Eric J. (1987/12)."Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F." Geochimica et Cosmochimica Acta 51(12): 3087-3103. <http://hdl.handle.net/2027.42/26500> http://www.sciencedirect.com/science/article/B6V66-48C8KHX-17K/2/d1dfd64912af39f1b4c71ad5e9b36552 https://hdl.handle.net/2027.42/26500 http://dx.doi.org/10.1016/0016-7037(87)90120-7 Geochimica et Cosmochimica Acta IndexNoFollow Geology and Earth Sciences Chemistry Science Article 1987 ftumdeepblue https://doi.org/10.1016/0016-7037(87)90120-7 2023-07-31T20:39:50Z The heat capacity of cryolite (Na3AlF6) has been measured from 7 to 1000 K by low-temperature adiabatic and high-temperature differential scanning calorimetry. Low-temperature data were obtained on material from the same hand specimen in the calorimetric laboratories of the University of Michigan and U.S. Geological Survey. The results obtained are in good agreement, and yield average values for the entropy of cryolite of: S0298 = 238.5 J/mol KS0T-S0298 = 145.114 ln T+ 193.009*10-3T- 10.366* 105/T2- 872.89 J/mol K (273-836.5 K)[Delta]STrans = 9.9J/mol KS0T-S0298 =198.414 ln T+73.203* 10-3T-63.814*105/T2-1113.11 J/mol K (836.5-1153 K) with the transition temperature between [alpha]- and [beta]-cryolite taken at 836.5 K.These data have been combined with data in the literature to calculate phase equilibria for the system Na---Fe---Al---Si---O---F. The resultant phase diagrams allow constraints to be placed on the fO2, fF2, aSiO2 and T conditions of formation for assemblages in alkalic rocks. A sample application suggests that log fO2 is approximately -19.2, log fF2 is -31.9 to -33.2, and aSiO2 is -1.06 at assumed P/T conditions of 1000 K, 1 bar for the villiaumite-bearing Ilimaussaq intrusion in southwestern Greenland. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/26500/3/0000036.pdf Article in Journal/Newspaper Greenland University of Michigan: Deep Blue Greenland Ilimaussaq ENVELOPE(-45.900,-45.900,60.983,60.983) Geochimica et Cosmochimica Acta 51 12 3087 3103 |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Geology and Earth Sciences Chemistry Science |
spellingShingle |
Geology and Earth Sciences Chemistry Science Anovitz, Lawrence M. Hemingway, Bruce S. Westrum, Jr. , Edgar F. Metz, Guy W. Essene, Eric J. Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
topic_facet |
Geology and Earth Sciences Chemistry Science |
description |
The heat capacity of cryolite (Na3AlF6) has been measured from 7 to 1000 K by low-temperature adiabatic and high-temperature differential scanning calorimetry. Low-temperature data were obtained on material from the same hand specimen in the calorimetric laboratories of the University of Michigan and U.S. Geological Survey. The results obtained are in good agreement, and yield average values for the entropy of cryolite of: S0298 = 238.5 J/mol KS0T-S0298 = 145.114 ln T+ 193.009*10-3T- 10.366* 105/T2- 872.89 J/mol K (273-836.5 K)[Delta]STrans = 9.9J/mol KS0T-S0298 =198.414 ln T+73.203* 10-3T-63.814*105/T2-1113.11 J/mol K (836.5-1153 K) with the transition temperature between [alpha]- and [beta]-cryolite taken at 836.5 K.These data have been combined with data in the literature to calculate phase equilibria for the system Na---Fe---Al---Si---O---F. The resultant phase diagrams allow constraints to be placed on the fO2, fF2, aSiO2 and T conditions of formation for assemblages in alkalic rocks. A sample application suggests that log fO2 is approximately -19.2, log fF2 is -31.9 to -33.2, and aSiO2 is -1.06 at assumed P/T conditions of 1000 K, 1 bar for the villiaumite-bearing Ilimaussaq intrusion in southwestern Greenland. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/26500/3/0000036.pdf |
author2 |
Department of Chemistry, Univ. of Michigan, Ann, Arbor, MI 48109, U.S.A. Department of Geological Sciences, Univ. of Michigan, Ann Arbor, MI 48109, U.S.A. Department of Geosciences, Univ. of Arizona, Tucson, AZ 85721, U.S.A.; Department of Geological Sciences, Univ. of Michigan, Ann Arbor, MI 48109, U.S.A. U.S. Geological Survey, 959 National Center, Reston, VA 22092, U.S.A. |
format |
Article in Journal/Newspaper |
author |
Anovitz, Lawrence M. Hemingway, Bruce S. Westrum, Jr. , Edgar F. Metz, Guy W. Essene, Eric J. |
author_facet |
Anovitz, Lawrence M. Hemingway, Bruce S. Westrum, Jr. , Edgar F. Metz, Guy W. Essene, Eric J. |
author_sort |
Anovitz, Lawrence M. |
title |
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
title_short |
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
title_full |
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
title_fullStr |
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
title_full_unstemmed |
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F |
title_sort |
heat capacity measurements for cryolite (na3alf6) and reactions in the system na---fe---al---si---o---f |
publisher |
Elsevier |
publishDate |
1987 |
url |
https://hdl.handle.net/2027.42/26500 http://www.sciencedirect.com/science/article/B6V66-48C8KHX-17K/2/d1dfd64912af39f1b4c71ad5e9b36552 https://doi.org/10.1016/0016-7037(87)90120-7 |
long_lat |
ENVELOPE(-45.900,-45.900,60.983,60.983) |
geographic |
Greenland Ilimaussaq |
geographic_facet |
Greenland Ilimaussaq |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Anovitz, Lawrence M., Hemingway, Bruce S., Westrum, Jr., Edgar F., Metz, Guy W., Essene, Eric J. (1987/12)."Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F." Geochimica et Cosmochimica Acta 51(12): 3087-3103. <http://hdl.handle.net/2027.42/26500> http://www.sciencedirect.com/science/article/B6V66-48C8KHX-17K/2/d1dfd64912af39f1b4c71ad5e9b36552 https://hdl.handle.net/2027.42/26500 http://dx.doi.org/10.1016/0016-7037(87)90120-7 Geochimica et Cosmochimica Acta |
op_rights |
IndexNoFollow |
op_doi |
https://doi.org/10.1016/0016-7037(87)90120-7 |
container_title |
Geochimica et Cosmochimica Acta |
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51 |
container_issue |
12 |
container_start_page |
3087 |
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3103 |
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1774718314621173760 |