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The word soil is a name left over from history. Rare earth elements have been discovered since the end of the century. At that time, people often referred to solid oxides that were insoluble in water as earth. Rare earths are generally separated in the oxide state and are very rare, so they are named rare earths. Lanthanum, cerium, praseodymium, neodymium, promethium, samarium, and europium are usually called light rare earths or cerium group rare earths, and gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium are called heavy rare earths or yttrium group rare earths. Some also divide scandium into three groups based on the similarities and differences in the physical and chemical properties of rare earth elements, except for scandium (some classify scandium into three groups of scattered elements, that is, the light rare earth group is lanthanum, cerium, praseodymium, neodymium, and promethium and the medium rare earth group The heavy rare earth groups are samarium, europium, gadolinium, terbium, and dysprosium, and the heavy rare earth group is holmium, erbium, thulium, ytterbium, lutetium, and yttrium.
Rare earths are a group of new types of rare earths that have electrical, magnetic, optical, and biological properties. Functional materials are important basic materials in high-tech fields such as information technology, biotechnology, and energy technology and in national defense construction. They also play an important role in transforming certain traditional industries such as agriculture, chemicals, and building materials. Rare earths are widely used and can be used A wide range of functional materials are forming a large-scale high-tech industrial group with very broad market prospects and extremely important strategic significance. It is known as industrial vitamins.