In normal life, magnet is a very common thing. And thousands of years ago, the working people of our country made one compass of one of the four great inventions according to the characteristics of the magnet. Until today, magnets are also very useful. From all kinds of special electronic devices to the usual teaching toys, we can often see the shapes of magnets. The picture below is a horseshoe magnet. The bulk metal on the top is gadolinium (g). It is an element that can be attracted by magnet like iron, cobalt and nickel, and is widely used in the field of magnetic resonance imaging.
We know that the main component of magnets is triiron tetroxide. An ordinary small magnet is made of black ferrous oxide. However, due to the nature of iron tetroxide itself, the suction of iron objects will not be too strong, and its magnetic properties will gradually weaken over time. In this case, how can we make a magnet that is more attractive and should not be degraded? Under this premise, NdFeB magnets came into being.www.greatmagtech.com
This kind of surface is anti-corrosion treatment and bright shiny magnet is neodymium iron boron magnet, its chemical formula is Nd2Fe14B. The most commonly used neodymium-iron-boron magnet is made of high-temperature sintering of three elements: niobium, iron, and boron. It is by far the most powerful artificial magnet. If the core element of traditional iron tetroxide is iron, then the reason why NdFeB magnets have such strong magnetism is the role of yttrium elements. The following pieces of metal in the figure below are:
Neodymium (n) is the fourth element of the lanthanide family in the rare earth element. Like iron, cobalt, nickel and gadolinium mentioned earlier, it itself can also be attracted by magnets. In addition, neodymium is more active in lanthanides, so it is easily oxidized as iron. This is why NdFeB magnets are coated on the surface. If neodymium is used to enhance magnetism, the role of boron can not be ignored. This black and black thing is boron.www.greatmagtech.com
In the periodic table of elements, boron is located on the left side of carbon, and therefore boron chemistry similar to carbon-centered organic chemistry has recently appeared. In neodymium-iron-boron magnets, boron acts as a mediator of thorium and iron. Boron, under the condition that its molecular structure is stable, greatly expands the maximum magnetic property that can be produced by the material, making the magnetic property of the entire magnet extremely high, even allowing him to pick up an object equal to 640 times his own weight.