| Инд. авторы: | Ito E., Yamazaki D., Yoshino T., Fukui H., Zhai S., Shatzkiy A, Katsura T., Tange Y., Funakoshi K.-I. |
| Заглавие: | Pressure generation and investigation of the post-perovskite transformation in MgGeO3 by squeezing the Kawai-cell equipped with sintered diamond anvils |
| Библ. ссылка: | Ito E., Yamazaki D., Yoshino T., Fukui H., Zhai S., Shatzkiy A, Katsura T., Tange Y., Funakoshi K.-I. Pressure generation and investigation of the post-perovskite transformation in MgGeO3 by squeezing the Kawai-cell equipped with sintered diamond anvils // Earth and Planetary Science Letters. - 2010. - Vol.293. - Iss. 1-2. - P.84-89. - ISSN 0012-821X. - EISSN 1385-013X. |
| Внешние системы: | DOI: 10.1016/j.epsl.2010.02.023; SCOPUS: 2-s2.0-77950341410; |
| Реферат: | eng: High pressure generation has been tried by using the Kawai-cell equipped with sintered diamond cubes and the synchrotron radiation at SPring-8. The maximum attainable pressure reached 90.4GPa at 300K based on the Anderson et al. (1989) Au scale. Simultaneously, we investigated the perovskite (Pv)-postperovskite (PPv) transformation in MgGeO3 up to ca. 74GPa and 2200K by means of in situ X-ray diffraction method. Transformation from Pv to PPv was observed at pressures and temperatures higher than 63GPa and 1300K. Both the forward and the reverse reactions were found to be fairly sluggish over the examined temperature range. We determined the phase boundary by passing through the conditions at which either Pv or PPv phase grew and that of coexistence of both the phases, which is expressed by the equation T(K)=177 P(GPa)-9677. Our dP/dT slope of 5.6MPa/K for MgGeO3 is close to the minimum estimate for MgSiO3 and accordingly suggests relatively deeper D′ discontinuity and a high heat flux from the core. We emphasize that the phase boundary completely relies on the pressure scale adopted. © 2010 Elsevier B.V.
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| Ключевые слова: | Andersons; High heat flux; High pressure; High pressure generation; In-situ; X-ray diffraction; perovskite; high pressure; heat flux; estimation method; equation of state; diamond; Diamonds; X ray diffraction; Sintering; Perovskite; Oxide minerals; Temperature range; SPring-8; Sintered diamond; Reverse reactions; Pressure scale; Pressure generation; Post-perovskite; The D′ layer; Sintered diamond; MgGeO3; Kawai-cell; The postperovskite transformation; High pressure generation; |
| Издано: | 2010 |
| Физ. характеристика: | с.84-89 |