Raman spectroscopy of natural cordierite at high water pressure up to 5GPa
The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5GPa. However, the distortion of the ring tetrahedra observed previously at 2.3GPa is supposed to introduc...
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| Veröffentlicht in: | Journal of Raman spectroscopy 2012-04, Vol.43 (4), p.559-563 |
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| container_title | Journal of Raman spectroscopy |
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| creator | Likhacheva, Anna Yu Goryainov, Sergey V Krylov, Aleksandr S Bul'bak, Taras A Prasad, Pinnelli S R |
| description | The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5GPa. However, the distortion of the ring tetrahedra observed previously at 2.3GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7GPa in a diamond anvil cell. At P>4GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O-H stretching modes at about 4.5GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P |
| doi_str_mv | 10.1002/jrs.3060 |
| format | Article |
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However, the distortion of the ring tetrahedra observed previously at 2.3GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7GPa in a diamond anvil cell. At P>4GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O-H stretching modes at about 4.5GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P<3GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high-pressure phase is likely a consequence of distortion of the channel-forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd. [PUBLICATION ABSTRACT]</description><identifier>ISSN: 0377-0486</identifier><identifier>EISSN: 1097-4555</identifier><identifier>DOI: 10.1002/jrs.3060</identifier><identifier>CODEN: JRSPAF</identifier><language>eng</language><publisher>Bognor Regis: Wiley Subscription Services, Inc</publisher><subject>Amplitudes ; Cordierite ; Distortion ; Phase shift ; Phase transformations ; Polyhedra ; Polyhedrons ; Raman spectroscopy</subject><ispartof>Journal of Raman spectroscopy, 2012-04, Vol.43 (4), p.559-563</ispartof><rights>Copyright © 2012 John Wiley & Sons, Ltd.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,27905,27906</link.rule.ids></links><search><creatorcontrib>Likhacheva, Anna Yu</creatorcontrib><creatorcontrib>Goryainov, Sergey V</creatorcontrib><creatorcontrib>Krylov, Aleksandr S</creatorcontrib><creatorcontrib>Bul'bak, Taras A</creatorcontrib><creatorcontrib>Prasad, Pinnelli S R</creatorcontrib><title>Raman spectroscopy of natural cordierite at high water pressure up to 5GPa</title><title>Journal of Raman spectroscopy</title><description>The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5GPa. However, the distortion of the ring tetrahedra observed previously at 2.3GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7GPa in a diamond anvil cell. At P>4GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O-H stretching modes at about 4.5GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P<3GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high-pressure phase is likely a consequence of distortion of the channel-forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd. [PUBLICATION ABSTRACT]</description><subject>Amplitudes</subject><subject>Cordierite</subject><subject>Distortion</subject><subject>Phase shift</subject><subject>Phase transformations</subject><subject>Polyhedra</subject><subject>Polyhedrons</subject><subject>Raman spectroscopy</subject><issn>0377-0486</issn><issn>1097-4555</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNpdj01LAzEURYMoWKvgTwi4cTP1vcnnLKVoVQqKdF_SNLEzTCdjkkH89wZ0JVy4m8PlXEKuERYIUN91MS0YSDghM4RGVVwIcUpmwJSqgGt5Ti5S6gCgaSTOyMu7OZqBptHZHEOyYfymwdPB5CmantoQ962LbXbUZHpoPw70y2QX6RhdSlN0dBppDlSs3swlOfOmT-7qr-dk8_iwWT5V69fV8_J-XY0S60oKj7zR2DQ1V-iEsdJzLllx86iEtkIqg17XRd7vHat3VrES6fVOaotsTm5_Z8cYPieX8vbYJuv63gwuTGmLgmM5rbAu6M0_tAtTHIpcoVBxAI3AfgCMkFnI</recordid><startdate>20120401</startdate><enddate>20120401</enddate><creator>Likhacheva, Anna Yu</creator><creator>Goryainov, Sergey V</creator><creator>Krylov, Aleksandr S</creator><creator>Bul'bak, Taras A</creator><creator>Prasad, Pinnelli S R</creator><general>Wiley Subscription Services, Inc</general><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>7U9</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>H94</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>P64</scope><scope>RC3</scope></search><sort><creationdate>20120401</creationdate><title>Raman spectroscopy of natural cordierite at high water pressure up to 5GPa</title><author>Likhacheva, Anna Yu ; 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| ispartof | Journal of Raman spectroscopy, 2012-04, Vol.43 (4), p.559-563 |
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| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Amplitudes Cordierite Distortion Phase shift Phase transformations Polyhedra Polyhedrons Raman spectroscopy |
| title | Raman spectroscopy of natural cordierite at high water pressure up to 5GPa |
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