HIGH-PRESSURE PHASE TRANSITION AND BEHAVIOR OF PROTONS IN BRUCITE MG(OH)2: A HIGH-PRESSURE-TEMPERATURE STUDY USING IR SYNCHROTRON RADIATION
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dc.contributor.author | Shinoda K. | |
dc.contributor.author | Yamakata M. | |
dc.contributor.author | Nanba T. | |
dc.contributor.author | Kimura H. | |
dc.contributor.author | Moriwaki T. | |
dc.contributor.author | Kondo Y. | |
dc.contributor.author | Kawamoto T. | |
dc.contributor.author | Niimi N. | |
dc.contributor.author | Miyoshi N. | |
dc.contributor.author | Aikawa N. | |
dc.date.accessioned | 2021-06-03T06:25:19Z | |
dc.date.available | 2021-06-03T06:25:19Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1361062 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2002, 29, 6, 396-402 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28792 | |
dc.description.abstract | Infrared absorption spectra of brucite Mg (OH)2 were measured under high pressure and high temperature from 0.1 MPa 25 °C to 16 GPa 360 °C using infrared synchrotron radiation at BL43IR of Spring-8 and a high-temperature diamond-anvil cell. Brucite originally has an absorption peak at 3700 cm-1, which is due to the OH dipole at ambient pressure. Over 3 GPa, brucite shows a pressure-induced absorption peak at 3650 cm-1. The pressure-induced peak can be assigned to a new OH dipole under pressure. The new peak indicates that brucite has a new proton site under pressure and undergoes a high-pressure phase transition. From observations of the pressure-induced peak under various P-T condition, a stable region of the high-pressure phase was determined. The original peak shifts to lower wavenumber at -0.25 cm-1 GPa-1, while the pressure-induced peak shifts at -5.1 cm-1 GPa-1. These negative dependences of original and pressure-induced peak shifts against pressure result from enhanced hydrogen bond by shortened O-H···O distance, and the two dependences must result from the differences of hydrogen bond types of the original and pressure-induced peaks, most likely from trifurcated and bent types, respectively. Under high pressure and high temperature, the pressure-induced peak disappears, but a broad absorption band between 3300 and 3500 cm-1 was observed. The broad absorption band may suggest free proton, and the possibility of proton conduction in brucite under high pressure and temperature. | |
dc.subject | BRUCITE | |
dc.subject | INFRARED SYNCHROTRON RADIATION (IRSR) | |
dc.subject | IR MICROSPECTROSCOPY | |
dc.subject | HIGH-TEMPERATURE DIAMOND-ANVIL CELL (HTDAC) | |
dc.subject | HIGH-PRESSURE PHASE TRANSITION | |
dc.subject | PROTON TRANSFER | |
dc.subject | SPRING-8 | |
dc.title | HIGH-PRESSURE PHASE TRANSITION AND BEHAVIOR OF PROTONS IN BRUCITE MG(OH)2: A HIGH-PRESSURE-TEMPERATURE STUDY USING IR SYNCHROTRON RADIATION | |
dc.type | Статья |
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