Superconductivity of MgB2
Overview of MgB2
Magnesium diboride MgB2 is an ionic compound having a hexagonal crystal structure. It is an intercalation compound with alternating layers of magnesium and boron.
Magnesium diboride will be transformed into a superconductor at an absolute temperature of 40K (equivalent to -233°C). Its actual working temperature is 20~30K. To reach this temperature, we can use liquid neon gas, liquid hydrogen or a closed-cycle refrigerator to complete the cooling. Different from the current industry that uses liquid helium to cool replacement alloys (4K), these methods are simpler and more economical. Once carbon or other impurities, magnesium diboride, or current are passed in the magnetic field, the ability to maintain superconductivity is as much as ≤ alloy, or even better.
Superconducting magnets, transmission lines and sensitive magnetic field detectors.
The product should be sealed and stored in a cool and dry room. Exposure to the air should be avoided to prevent moisture agglomeration, which will affect the dispersion performance and affect the use. Pressure should be avoided.
Why is MgB2 superconducting?
Superconductors, as the name suggests, are conductors that do not dissipate energy after passing current. After the Dutch scientist Onnes discovered the superconductivity of mercury in 1911, people only increased the transition temperature to 23K (about minus zero) in the following seventy years. 250℃). In early March 2001, Japanese scientists reported that the binary material magnesium diboride (MgB2
) exhibited superconducting properties at around 39K. Boron atoms have fewer valence electrons than carbon, so not all σ bands are occupied. This means that the lattice vibration in the plane is much greater, which leads to the formation of strong electron pairs.
"Materials Science and Engineering: B": The use of ultrasonic technology can reduce the cost of magnesium diboride superconductors
Researchers at Shibaura Institute of Technology (SIT) in Japan have developed a Technology that uses ultrasonic treatment to increase the critical current density (Jc) of bulk MgB2.
The specific method is to dissolve cheap commercial boron in hexane and use ultrasound to thoroughly disperse the solute. Once the hexane is evaporated and removed, very fine boron powder can be obtained, which is then sintered with magnesium to produce magnesium boride.
The researchers produced high-quality bulk magnesium boride, most of which did not contain oxidizing impurities. Compared with the non-sonicated sample used as a reference, the Jc value increased by 20%, depending on the sonication time used.
In addition, the results of scanning electron microscopy and energy dispersive X-ray spectroscopy revealed a second mechanism that may lead to enhancement of Jc. The team noticed a layered structure covering the boron-deficient pore walls, which appeared to be a magnesium boron oxide coating.
The researchers said, "This will help reduce the difficulty and cost of superconductor-based technology, and make it easier for the general public, especially in the medical field, to use these technologies."
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