Rare Earth Resources and Related Industries in Japan
Rare Earth Resources and Related Industries in Japan
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日本稀土资源及相关产业
DOI：
10.2473/journalofmmij.127.549
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Tatsuo Ôta
中科院分区：
文献类型：
--
作者：
Tatsuo Ôta
表1所示的元素周期表突出显示了17种元素，包括钪，钇和15种称为“镧系元素”的元素1。元素按照水平显示的原子序数排列，垂直显示最外层的同一类型的电子。每个元素的电子数和类型给出了物理和化学性质2。可以说，这些被称为“稀土元素”的元素在某些物理和化学性质上彼此相似，因为最外层的电子是相同的。虽然稀土没有明确的分类，但表2显示了两种方法的常见分类。一种是分为两类，另一种是分为三类。硫酸钾复盐在水中的溶解度按使用情况分为三类，例如不溶;轻稀土，难溶;中稀土，易溶;重稀土3。
The periodic table of the elements, shown in Table 1, highlights 17 elements comprising Scanndium, Yttrium and 15 elements known as “lanthanoids”1. The elements are lined up according to the atomic number displayed horizontally and the same type of electrons in the outermost shell vertically. The electron number and type of each element gives the physical and chemical properties2. It can be said that these elements called “rare earth elements” are similar to each other in some physical and chemical characters because the outermost electrons are the same1. Although there is no defined classification in rare earth, Table 2 shows common classifications of two methods. One is to classify into two categories and the other is into three categories. Solubility of potassium sulfate double salt into water is used in the case of three categories, e.g. not to solve; light rare earth, difficult to solve; middle rare earth, easy to solve; heavy rare earth3.