內地核

地球的內核，是地球的最深層的部份，半徑1220公里^[1]^[2]。一般相信它以鐵-鎳之合金組成，以及大概與太陽表面溫度相同，約為5700開氏度。

溫度與壓力

內地核的溫度與壓力可以通過理論與試驗方式估計出鐵在內地核與外地核邊界壓力（約330 GPa）時的融化溫度。溫度估計為5,700 K（5,400 °C；9,800 °F）。^[3] 內地核的壓強略高於內外地核邊界：估計在330至360吉帕斯卡（3,300,000至3,600,000標準大氣壓）。^[4]鐵在這麼高的壓力下是固體，因為其熔點隨壓力戲劇性增高（參見克勞修斯－克拉佩龍方程）。^[5]

Science雜誌上的一篇論文 ^[6]認為內地核邊界鐵的熔點是6230 ± 500 K。

參見

參考文獻

^ Monnereau, Marc; Calvet, Marie; Margerin, Ludovic; Souriau, Annie. Lopsided Growth of Earth's Inner Core. Science. May 21, 2010, 328 (5981): 1014–1017. Bibcode:2010Sci...328.1014M. PMID 20395477. doi:10.1126/science.1186212.
^ E. R. Engdahl; E. A. Flynn & R. P. Massé. Differential PkiKP travel times and the radius of the core. Geophys. J. R. Astr. Soc. 1974, 40 (3): 457–463. Bibcode:1974GeoJI..39..457E. doi:10.1111/j.1365-246X.1974.tb05467.x.
^ D. Alfè; M. Gillan & G. D. Price. Composition and temperature of the Earth's core constrained by combining ab initio calculations and seismic data (PDF). Earth and Planetary Science Letters (Elsevier). January 30, 2002, 195 (1–2): 91–98 [2018-12-15]. Bibcode:2002E&PSL.195...91A. doi:10.1016/S0012-821X(01)00568-4. （原始內容 (PDF)存檔於2019-02-03）.
^ David. R. Lide (編). CRC Handbook of Chemistry and Physics 87th. 2006–2007: j14–13 [2018-12-15]. （原始內容存檔於2017-07-24）.
^ Anneli Aitta. Iron melting curve with a tricritical point. Journal of Statistical Mechanics: Theory and Experiment (iop). 2006-12-01, 2006 (12): 12015–12030 [2018-12-15]. Bibcode:2006JSMTE..12..015A. arXiv:cond-mat/0701283  . doi:10.1088/1742-5468/2006/12/P12015. （原始內容存檔於2019-09-13）. or see preprints https://arxiv.org/pdf/cond-mat/0701283 , https://arxiv.org/pdf/0807.0187 .
^ S. Anzellini; A. Dewaele; M. Mezouar; P. Loubeyre & G. Morard. Melting of Iron at Earth’s Inner Core Boundary Based on Fast X-ray Diffraction. Science (AAAS). 2013, 340 (6136): 464–466 [2018-12-15]. Bibcode:2013Sci...340..464A. doi:10.1126/science.1233514. （原始內容存檔於2015-11-04）.

[1] Monnereau, Marc; Calvet, Marie; Margerin, Ludovic; Souriau, Annie. Lopsided Growth of Earth's Inner Core. Science. May 21, 2010, 328 (5981): 1014–1017. Bibcode:2010Sci...328.1014M. PMID 20395477. doi:10.1126/science.1186212.

[2] E. R. Engdahl; E. A. Flynn & R. P. Massé. Differential PkiKP travel times and the radius of the core. Geophys. J. R. Astr. Soc. 1974, 40 (3): 457–463. Bibcode:1974GeoJI..39..457E. doi:10.1111/j.1365-246X.1974.tb05467.x.

[alfè-3] D. Alfè; M. Gillan & G. D. Price. Composition and temperature of the Earth's core constrained by combining ab initio calculations and seismic data (PDF). Earth and Planetary Science Letters (Elsevier). January 30, 2002, 195 (1–2): 91–98 [2018-12-15]. Bibcode:2002E&PSL.195...91A. doi:10.1016/S0012-821X(01)00568-4. （原始內容 (PDF)存檔於2019-02-03）.

[crc-4] David. R. Lide (編). CRC Handbook of Chemistry and Physics 87th. 2006–2007: j14–13 [2018-12-15]. （原始內容存檔於2017-07-24）.

[5] Anneli Aitta. Iron melting curve with a tricritical point. Journal of Statistical Mechanics: Theory and Experiment (iop). 2006-12-01, 2006 (12): 12015–12030 [2018-12-15]. Bibcode:2006JSMTE..12..015A. arXiv:cond-mat/0701283  . doi:10.1088/1742-5468/2006/12/P12015. （原始內容存檔於2019-09-13）. or see preprints https://arxiv.org/pdf/cond-mat/0701283 , https://arxiv.org/pdf/0807.0187 .

[6] S. Anzellini; A. Dewaele; M. Mezouar; P. Loubeyre & G. Morard. Melting of Iron at Earth’s Inner Core Boundary Based on Fast X-ray Diffraction. Science (AAAS). 2013, 340 (6136): 464–466 [2018-12-15]. Bibcode:2013Sci...340..464A. doi:10.1126/science.1233514. （原始內容存檔於2015-11-04）.

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