| Abstract: | Heat capacity measurements are reported for a well-characterized boehmite that differ significantly from results reported earlier by Shomate and Cook (1946) for a monohydrate of alumina. It is suggested that the earlier measurements were made on a sample that was a mixture of phases and that use of that heat-capacity and derived thermodynamic data be discontinued. The entropy of boehmite derived in this study is 37.19 ?? 0.10 J/(mol.K) at 298.15 K. Based on our value for the entropy and accepting the recommended Gibbs free energy for Al(OH)-4, the Gibbs free energy and enthalpy of formation of boehmite are calculated to be -918.4 ?? 2.1 and -996.4 ?? 2.2 kJ/mol, respectively, from solubility data for boehmite. The Gibbs energy for boehmite is unchanged from that given by Hemingway et al. (1978). -from Authors |
| Genre: | Article |
| ProdID: | 70016664 |
| Citation Author: | Hemingway, B. S.; Robie, R. A.; Apps, J. A. |
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| Citation End Page: | 457 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Mineralogist |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Revised values for the thermodynamic properties of boehmite, AlO(OH) , and related species and phases in the system Al-H-O; 1991; Article; Journal; American Mineralogist; Hemingway, B. S.; Robie, R. A.; Apps, J. A. |
| Citation Start Page: | 445 |
| Citation Volume: | 76 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Revised values for the thermodynamic properties of boehmite, AlO(OH) , and related species and phases in the system Al-H-O; 1991; Article; Journal; American Mineralogist; Hemingway, B. S.; Robie, R. A.; Apps, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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