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In everyday life, Neodymium magnets are a very common thing. And thousands of years ago, the people made a compass for one of the four inventions based on the characteristics of the neodymium magnet. Until now, Neodymium magnets are also a very useful thing. From a variety of special electronic equipment, to the usual teaching aids toys, you can often see the neodymium magnet figure. The picture below shows a horseshoe neodymium magnet, and the block metal sucked on it is g (gá). This is an element that can be attracted to neodymium magnets like iron, cobalt, and nickel, and is currently widely used in the field of enhanced neodymium magnetic resonance imaging.

We know that the main component of neodymium magnets is triiron tetroxide. An ordinary small neodymium magnet is made of black iron trioxide. However, due to the nature of the ferroferric oxide itself, the suction of the iron object is not too strong, and its neodymium magnetism will gradually weaken over time. In this case, how can we make a neodymium magnet that is more attractive and not suitable for decay? Under this premise, NdFeB Neodymium magnets came into being.

The neodymium magnet whose surface is polished by anti-corrosion treatment is a neodymium iron boron neodymium magnet, and its chemical formula is Nd2Fe14B. The most commonly used NdFeB neodymium magnets are sintered at high temperatures from lanthanum, iron and boron. They are the most powerful artificial neodymium magnets to date. If the core element of the traditional ferroferric oxide is iron, then the reason why the neodymium iron boron neodymium magnet has such a strong neodymium magnetic property is the role of the strontium element. The pieces of metal in the picture below are:

Neodymium (nǚ) is the fourth element of the lanthanide family in rare earth elements. Like iron, cobalt, nickel and the aforementioned bismuth, it itself can also be attracted by neodymium magnets. In addition, lanthanum is more active in actinides, so it is as easily oxidized as iron, which is why the surface of NdFeB neodymium magnets is plated. If 钕 is used to enhance neodymium magnetism, then the role of boron can not be underestimated. This dark thing is boron:

In the periodic table, boron is located to the left of the carbon, so boron chemistry similar to carbon-centered organic chemistry has recently emerged. In NdFeB neodymium magnets, boron is equivalent to the mediator of bismuth and iron. Boron greatly enhances the maximum neodymium magnetic properties that can be produced by the material while ensuring its molecular structure is stable, making the neodymium magnetic properties of the entire neodymium magnet extremely high, even allowing him to absorb objects equivalent to 640 times its own weight.