内地核

地球的内核，是地球的最深层的部份，半径1220公里^[1]^[2]。一般相信它以铁-镍之合金组成，以及大概与太阳表面温度相同，约为5700开氏度。

温度与压力

内地核的温度与压力可以通过理论与试验方式估计出铁在内地核与外地核边界压力（约330 GPa）时的融化温度。温度估计为5,700 K（5,400 °C；9,800 °F）。^[3] 内地核的压强略高于内外地核边界：估计在330至360吉帕斯卡（3,300,000至3,600,000标准大气压）。^[4]铁在这么高的压力下是固体，因为其熔点随压力戏剧性增高（参见克劳修斯－克拉佩龙方程）。^[5]

Science杂志上的一篇论文 ^[6]认为内地核边界铁的熔点是6230 ± 500 K。

参见

参考文献

^ 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. （原始内容 (PDF)存档于2019-02-03）.
^ David. R. Lide (编). CRC Handbook of Chemistry and Physics 87th. 2006–2007: j14–13 [2018-12-15]. （原始内容存档于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. （原始内容存档于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. （原始内容存档于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. （原始内容 (PDF)存档于2019-02-03）.

[crc-4] David. R. Lide (编). CRC Handbook of Chemistry and Physics 87th. 2006–2007: j14–13 [2018-12-15]. （原始内容存档于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. （原始内容存档于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. （原始内容存档于2015-11-04）.

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