Science. 1987 Apr 10;236(4798):181-2. doi: 10.1126/science.236.4798.181.
The melting curve of iron, the primary constituent of Earth's core, has been measured to pressures of 250 gigapascals with a combination of static and dynamic techniques. The melting temperature of iron at the pressure of the core-mantle boundary (136 gigapascals) is 4800 +/- 200 K. whereas at the inner core-outer core boundary (330 gigapascals), it is 7600 +/- 500 K. Corrected for melting point depression resulting from the presence of impurities, a melting temperature for iron-rich alloy of 6600 K at the inner core-outer core boundary and a maximum temperature of 6900 K at Earth's center are inferred. This latter value is the first experimental upper bound on the temperature at Earth's center, and these results imply that the temperature of the lower mantle is significantly less than that of the outer core.
铁的熔融曲线是地球核心的主要成分，已经使用静态和动态技术测量到 250 吉帕斯卡的压力。在核心-地幔边界（136 吉帕斯卡）的压力下，铁的熔融温度为 4800 +/- 200 K，而在内核-外地核边界（330 吉帕斯卡）的压力下，铁的熔融温度为 7600 +/- 500 K。对于富铁合金，考虑到杂质引起的熔点降低，推断出在内核-外地核边界的熔融温度为 6600 K，在地球中心的最高温度为 6900 K。后一个值是地球中心温度的第一个实验上限，这些结果表明下地幔的温度明显低于外地核。
