Light rare earth elements include lanthanum, cerium, praseodymium, neodymium, promethium, samarium and europium.
Heavy rare earths include gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium.
Rare earth is called "gold" in industry. Because of its excellent physical properties such as optoelectromagnetism, it can be combined with other materials to form new materials with different properties. Its most significant function is to greatly improve the quality and performance of other products.
Greatly improve the tactical performance of steel, aluminum alloy, magnesium alloy and titanium alloy used to manufacture tanks, planes and missiles. Moreover, rare earth is also a lubricant for electronics, lasers, nuclear industry, superconductivity and many other high technologies.
Extended data
The results show that rare earth elements can increase the chlorophyll content of plants, enhance photosynthesis, promote root development and increase the absorption of nutrients by roots. Rare earth can also promote seed germination, improve seed germination rate and promote seedling growth. In addition to the above main functions, it also has the ability to enhance the disease resistance, cold resistance and drought resistance of some crops.
A large number of studies also show that the use of appropriate concentrations of rare earth elements can promote the absorption, transformation and utilization of nutrients by plants. Seed dressing of maize with rare earth advanced the emergence and jointing stage by 1 ~ 2 days, increased the plant height by 0.2 meters, advanced the seeds by 3 ~ 5 days, and increased the yield by 14%.
When soybean seeds were dressed with rare earth, the emergence was advanced 1 day, the number of pods per plant increased 14.8 ~ 26.6, the number of three pods increased, and the yield increased 14.5% ~ 20.0%. Spraying rare earth can improve the Vc content, total sugar content and sugar-acid ratio of apple and citrus fruits, and promote fruit coloring and early maturity. It can also inhibit the respiratory intensity during storage and reduce the decay rate.
Reference materials? Baidu encyclopedia-rare earth