| Abstract: | Hydrogen impurities in materials influence their properties, including flow strength. ??-Al2O3 single crystals and polycrystalline ceramics were annealed in supercritical water between 850 and 1025??C, under pressures in the range 1500-2000 MPa. A few specimens were further subjected to plastic deformation. Hydrogen penetration was examined using infrared absorption measurements of O-H bond vibrations, which revealed two kinds of hydrogen defects. In single crystals, defects are characterized by sharp O-H absorption bands assigned to interstitial protons. Hydrogen impurities of hydrothermally annealed ceramics and of all hydrothermally deformed specimens are characterized by broad O-H bands assigned to molecular water. The grain boundaries of hydrothermally annealed ceramics are severely damaged. The kinetics of hydrogen penetration is consistent with diffusion data. |
| Genre: | Article |
| ProdID: | 70022939 |
| Citation Author: | Kronenberg, A. K.; Castaing, J.; Mitchell, T. E.; Kirby, S. H. |
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| Citation End Page: | 1494 |
| Citation Issue: | 7 |
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| Citation Language: | English |
| Citation Larger Work Title: | Acta Materialia |
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| Citation Number Of Pages: | 14 |
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| Citation Publisher: | Elsevier Science Ltd |
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| Citation Search Results Text: | Hydrogen defects in ??-Al2O3 and water weakening of sapphire and alumina ceramics between 600 and 1000??C - I. Infrared characterization of defects; 2000; Article; Journal; Acta Materialia; Kronenberg, A. K.; Castaing, J.; Mitchell, T. E.; Kirby, S. H. |
| Citation Start Page: | 1481 |
| Citation Volume: | 48 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Hydrogen defects in ??-Al2O3 and water weakening of sapphire and alumina ceramics between 600 and 1000??C - I. Infrared characterization of defects; 2000; Article; Journal; Acta Materialia; Kronenberg, A. K.; Castaing, J.; Mitchell, T. E.; Kirby, S. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S1359-6454(99)00448-6 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
| Publisher: | Elsevier Science Ltd |
