Japanese scientists have found a common metal compound - magnesium diboride cooled to absolute temperature 39K (minus 234 degrees Celsius), will exhibit superconducting properties.
It is by far the highest critical temperature, nature particularly stable metal compounds, for developing low-cost high-performance superconducting material opens up new roads.
Previously identified superconducting materials are either with extremely low critical temperature or complex ingredients and expensive, or the capability to carry the current strength is small. If you want large-scale applications, such as manufacturing superconducting transmission lines, these materials are not very economical and practical.
Scientists say that according to the ratio of 1 to 2 to mix with the 99.9% magnesium powder and 99% amorphous boron powder, pressing into pellets and heated at high pressure nitrogen to obtain magnesium diboride. It was found that, when cooled to 39K, magnesium diboride showing significant superconducting characteristics.
In the current developed high-temperature superconducting material, the highest critical temperature can up to 160K, is much higher than magnesium diboride’s 39K. But metal powder supplier think that boron powder and magnesium powder with low price, magnesium diboride also easy to prepare, it is a common inexpensive chemical, with stable nature, simple ingredients, these benefits are complex and expensive copper-oxide superconducting materials can not compare. If can through the method of doping a small amount of impurities to significantly increase its critical temperature, magnesium diboride with great potential to become a low-cost, practical new superconducting material.
After the name of superconductor suggests is without energy dissipation through current conductor, it is due to a large number of unpaired electrons condense into a "lockstep" coherent state, its movement from the lattice scattering. In 1911, after the Dutch scientists found the mercury superconductivity, people have been expecting to find room temperature superconductors. End of 1986, the Swiss Reynolds and Miller in the never thought original oxide found transition temperature was above 30K superconductor, set off a pair of high-temperature superconductivity chase in the world. Currently oxide superconductor’s transition temperature was as high as 130K or more, in some aspects of the application has already been felt. However, due to its own characteristics, the oxide superconductor application in many areas is restricted.
Early March of 2001, Japanese scientists reported magnesium diboride material in around 39 K will exhibit superconducting properties. This discovery quickly sparked worldwide research boom. Researches on the nature of magnesium diboride superconductor is progressing very quickly, the understanding of the magnesium diboride superconductors mechanism also deepening.
The opportunities of magnesium diboride superconductors in the application will more exciting. First, the superconductor at a temperature of about 20 K, 8 times of the Earth's magnetic field can carry large superconducting currents and with very low energy consumption. Secondly, magnesium diboride material prices are very low, and much easier to mechanical workout than ceramic characteristics oxide high-temperature superconductors. In addition, the superconducting coherence length of magnesium diboride is longer, easy to prepare a superconducting quantum interference device for the detection of weak electromagnetic signals, in the earth exploration, medical equipment, environmental and military has broad application prospects.
Source:http://www.mhcmp.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
Exploring the Potentials of Nano-Aluminum Powder
Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
