POST-STISHOVITE PHASE BOUNDARY IN SIO2 DETERMINED BY IN SITU X-RAY OBSERVATIONS
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dc.contributor.author | Ono S. | |
dc.contributor.author | Hirose K. | |
dc.contributor.author | Murakami M. | |
dc.contributor.author | Isshiki M. | |
dc.date.accessioned | 2021-04-17T00:44:00Z | |
dc.date.available | 2021-04-17T00:44:00Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1064581 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2002, 197, 3-4, 187-192 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27951 | |
dc.description.abstract | A laser heating diamond anvil cell experiment, with an angle-dispersive X-ray diffraction using synchrotron radiation source at the SPring-8, has been developed to observe the phase transition in silica (SiO2) between the P42/mnm (rutile-type) and Pnnm (CaCl2-type) up to pressures of 100 GPa and at temperatures up to 2200 K. The transition was observed in the vicinity of 55 GPa at room temperature, and showed a positive temperature dependence of the transition pressure. The phase boundary was determined to follow the equation P (GPa)=(51+/-2)+(0.012+/-0.005)xT (K). Our result gives a transition pressure of near 80 GPa and a depth of 1900 km at an expected lower mantle temperature of 2000-2500 K. Therefore, this SiO2 transition is not the cause of recent observations of seismic anomalies between 800 and 1600 km depth in the mid-lower mantle. | |
dc.subject | SILICA | |
dc.subject | STISHOVITE | |
dc.title | POST-STISHOVITE PHASE BOUNDARY IN SIO2 DETERMINED BY IN SITU X-RAY OBSERVATIONS | |
dc.type | Статья |
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