为什么地球核心的铁?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 09 - t01:14:52z //www.hoelymoley.com/feeds/question/7073 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/7073 12 为什么地球核心的铁? JohnWDailey //www.hoelymoley.com/users/4985 2015 - 12 - 13 - t21:41:16z 2018 - 02 - 12 - t23:23:23z < p >地球核心的两个主要成分是铁和镍。在纪录片和科学对话,可能比镍铁得到更多的关注,因为它占更大比例的核心。< / p > < p >但我考虑这个情况之前占更大的比例,而不是镍铁必须问:< / p > < p >为什么铁占大部分的地球的核心而不是镍?金属胜过其他吗?如果是,哪些优势?如果是第一金属镍的核心,而不是铁,磁场会如何影响? < / p > //www.hoelymoley.com/questions/7073/-/7074 # 7074 20. 答案由user15999为什么地球核心的铁? user15999 //www.hoelymoley.com/users/0 2015 - 12 - 13 - t22:27:44z 2015 - 12 - 13 - t22:27:44z < p >简而言之,太阳系中的铁/宇宙高于镍由于这一过程被称为核合成。< / p > < p >基本上只在宇宙起源是由氢,通过核聚变更重的元素/正在形成。从根本上说,氢融合成明星更重的元素,太阳正在把大量的氢变成氦通过与质子间的链。< / p > < p >最终随着恒星年龄的增长你开始看到更重的元素的融合,氦、碳、氮等直到你达到铁此时你所谓的铁峰,铁原子融合在一起需要释放更多的能量比。更重的元素都是在超新星,从而形成我们看到大量的低水平。如此丰富的镍仍高于所有其他更重的金属。< / p > < p > < a href = " https://en.wikipedia.org/wiki/Stellar_nucleosynthesis " > https://en.wikipedia.org/wiki/Stellar_nucleosynthesis < / > < / p > < p > < a href = " http://physics.info/nucleosynthesis/ " > http://physics.info/nucleosynthesis/ < / > < / p > //www.hoelymoley.com/questions/7073/-/7076 # 7076 11 答案由Gimelist为什么地球核心的铁? Gimelist //www.hoelymoley.com/users/725 2015 - 12 - 14 - t00:28:10z 2015 - 12 - 14 - t00:28:10z < p >我只能回答的问题为什么大多数都是铁。不太确定的磁性铁和镍。< / p > < p >在另一个答案,只是比镍铁周围。但地球也大量的其他金属:硅、镁、钙、铝。为什么是核心的铁镍合金,而不是其他东西呢?答案是氧气。< / p > < p >当你把一个金属和氧气,你形成一个氧化物——通常是固体,易碎,“泥土”的材料。最好的例子是金属铁+氧气=生锈。但并不是所有的金属都是一样的——一些金属氧比别人更“像”。如果你有一个原子的镁和铁,另一个,只有一个氧原子周围——它将首先与镁。 Considering the entire oxygen budget of the Earth, there was enough oxygen to bond with all of the silicon, magnesium, calcium, aluminium (and just about the rest of the periodic table) to form the solids we usually refer to as rocks. By the time you got to the less oxygen-loving elements, such as nickel and iron, you had very little oxygen left. You had enough to oxidise some of the iron and nickel, but not all of it. That's why there was a lot of iron and nickel that was left as metals.

During Earth's formation, the entire thing was molten. Metallic iron and nickel are denser than the oxidised stuff ("rocks"), so it sank to the bottom, forming the metallic core. The oxidised metals ended up forming the mantle on top of it.

 //www.hoelymoley.com/questions/7073/-/7099 # 7099 7 答案由DavePhD为什么地球核心的铁? DavePhD //www.hoelymoley.com/users/248 2015 - 12 - 15 - t21:22:27z 2015 - 12 - 15 - t21:22:27z < p >的主要原因有比镍铁在地球的核心,通常在宇宙中,镍56 beta-decays到铁56(通过钴56)。< / p > < p >镍56形式在< a href = " https://en.wikipedia.org/wiki/Asymptotic_giant_branch " rel = " noreferrer " >渐近明星< / >和超新星巨大的分支。然而,镍56衰变的半衰期6天。< / p > < p >核聚变的明星,他核(< a href = " https://en.wikipedia.org/wiki/Alpha_particle " rel = " noreferrer " > < / >)α粒子形式从氢。< / p > < p >大明星,当形成氦聚变不停止。< / p > < p >相反,形成碳12 < a href = " https://en.wikipedia.org/wiki/Triple-alpha_process " rel = " noreferrer " > < / >从三个α粒子。< / p > < p > < a href = " https://en.wikipedia.org/wiki/Carbon-burning_process " rel = " noreferrer " >碳12核融合产生oxygen-16 < / >, neon-20 magnesium-24。所有这些核相同数量的质子和中子。< / p > < p > < a href = " https://en.wikipedia.org/wiki/Silicon-burning_process " rel = " noreferrer " >系列仍在继续,通过融合一个接一个α粒子< / >。< / p > < p >镍56 Iron-52保险丝。然而,< / p > < p >不积极有利的添加另一个α粒子从zinc-60镍56。

Nickel-56 decays to Iron-56.

So in summary, it is the combination of the fact that Nickel-56 is at the end of a series of favorable alpha particle fusions, and the fact that Nickel-56 decays to Iron-56, that makes iron particularly abundant.
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