In normal life, magnets are a very common thing. And […]
In normal life, magnets are a very common thing. And thousands of years ago, the working people of our country made the compass, one of the four great inventions, based on the characteristics of magnets. Until today, magnets are also very useful. From all kinds of special electronic equipment to usual teaching aids and toys, magnets can often be seen.
We know that the main component of magnets is Fe3O4. An ordinary small magnet is made of black ferroferric oxide. However, due to the nature of Fe3O4, its attraction to iron objects will not be too strong, and its magnetism will gradually weaken over time. In this case, how can we make a magnet with stronger attraction and not suitable for decay? Under this premise, Strong neodymium magnets came into being.
This kind of shiny magnet with anti-corrosion treatment is Strong neodymium magnets, and its chemical formula is Nd2Fe14B. The most commonly used Strong neodymium magnets are made by high temperature sintering of neodymium, iron, and boron. They are by far the strongest artificial magnets. If iron is the core element of traditional Fe3O4, the reason why Strong neodymium magnets have such strong magnetism is the effect of neodymium.
Neodymium is the fourth element in the lanthanide family of rare earth elements. Like iron, cobalt, nickel and the aforementioned gadolinium, it can also be attracted by magnets. Besides, neodymium is the more active of the lanthanide elements, so it is as easily oxidized as iron, which is why the surface of Strong neodymium magnets is coated. If neodymium is used to enhance magnetism, then the role of boron should not be underestimated. This black thing is boron:
In the periodic table, boron is located to the left of carbon, so boron chemistry similar to carbon-centric organic chemistry has recently appeared. In Strong neodymium magnets, boron is equivalent to the mediator of neodymium and iron. Boron greatly expands the maximum magnetism that a substance can produce while ensuring the stability of its molecular structure, making the entire magnet extremely high in magnetic performance, and even allowing it to absorb objects 640 times its weight.