2020
DOI: 10.1002/9781119508229.ch3
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Phase and Melting Relations of Fe 3 C to 300 GPa and Carbon in the Core

Abstract: Carbon is a plausible candidate for a light element in the Earth's core. Here, we show that Fe 3 C melts incongruently to form Fe 7 C 3 and liquid at least up to 200 GPa based on in-situ X-ray diffraction measurements and textural observations of the recovered samples, and Fe 3 C is stable at least up to 300 GPa at high temperatures. The C content of the liquid coexisting with Fe 7 C 3 decreases and the Fe-Fe 3 C eutectic composition shifts toward the Fe-rich direction with increasing pressure. The present res… Show more

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Cited by 9 publications
(19 citation statements)
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References 60 publications
(97 reference statements)
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“…The stability of Fe 3 C is also supported by a recent shock experiment by Hu et al [16]. They reported no evidence for decomposition of Fe 3 C to Fe 7 C 3 and Fe in the pressure range from 80 GPa to 248 GPa along the Hugoniot, which is consistent with the results of Mashino et al [14] and Takahashi et al [15]. Therefore, Fe 3 C is an important potential constituent of the inner core.…”
Section: Introductionsupporting
confidence: 79%
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“…The stability of Fe 3 C is also supported by a recent shock experiment by Hu et al [16]. They reported no evidence for decomposition of Fe 3 C to Fe 7 C 3 and Fe in the pressure range from 80 GPa to 248 GPa along the Hugoniot, which is consistent with the results of Mashino et al [14] and Takahashi et al [15]. Therefore, Fe 3 C is an important potential constituent of the inner core.…”
Section: Introductionsupporting
confidence: 79%
“…For example, Mashino et al [14] reported Fe 3 C is stable up to 250 GPa, and they did not find any evidence for decomposition of Fe 3 C at around 150 GPa, as was reported by Liu et al [13]. More recently, Takahashi et al [15] studied the stability of Fe 3 C up to and above 300 GPa and showed that it was stable up to this pressure, whereas it melted incongruently into Fe 7 C 3 and liquid under the pressure and temperature conditions studied. The stability of Fe 3 C is also supported by a recent shock experiment by Hu et al [16].…”
Section: Introductionmentioning
confidence: 83%
“…This observation is contradicted, however, by Tateno et al's [23] in situ XRD measurements of the formation of Fe 3 C phase in their Fe sample in the DAC upon laser heating at about 340 GPa. More recent in situ XRD experiments also observed Fe 3 C to pressures greater than 250 GPa [167] (Figure 29b). Mookherjee et al [168] reported that Fe 3 C was energetically stable at all pressures to the centre of the Earth from first-principles calculations on reaction (R2) at T = 0.…”
Section: • Thermodynamic Model Of the Systemmentioning
confidence: 58%
“…The figure is from [156]. Takahashi et al [167]; McGuire et al [169]). The solid red line shows reaction Fe 3 C = Fe 7 C 3 +Fe calculated in [169].…”
Section: Figure 28mentioning
confidence: 99%
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