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Superconductivity

CERN Courier - Newly discovered compound is - IOP Publishing - article Less than six months after the metallic compound magnesium diboride was found to be a superconductor (April p11), scientists in the US have developed a practical technique for making wires from it. Magnesium diboride has been a known substance since the 1950s, but it had never been tested for superconductivity. The oxygen-tainted magnesium diboride films were able to work in magnetic fields almost twice as strong as those lacking the oxygen impurities. www.cerncourier.com /main/article/41/7/11   (385 words)

Magnesium Diboride ( MgB2 ) Superconducting Wires May Bring MRI Machines Into Every Doctor’s Surgery This caused great excitement in the field as magnesium diboride is a much simpler material than many of the mixed oxides superconductors that have been produced that become superconducting at higher temperatures. Magnesium diboride can be cooled with liquid neon, which is much more affordable then liquid helium and magnesium diboride is also cheaper than the niobium alloys used in MRI machines. However, for magnesium diboride to be useful in MRI machines, it needs to be available in wire form, which posed the next problem for researchers, otherwise it would be no more useful then the exotic mixed oxides that researchers have produced in laboratories. www.azom.com /details.asp?ArticleID=2370   (425 words)

Magnesium diboride: mind the gaps (August 2002) - News - PhysicsWeb The discovery that magnesium diboride is a superconductor with a transition temperature of 39 K is currently the ‘hottest’ paper in physics according to the Institute for Scientific Information in the US. Although 39 K does not qualify magnesium diboride for status as a high-temperature superconductor, the transition temperature of this relatively simple material is much higher than predicted by naive theories. Magnesium diboride is a metal with a layered structure in which the boron atoms form hexagonal layers and the magnesium atoms are located in between the boron layers, above and below the centres of the hexagons. physicsweb.org /article/news/6/8/9   (394 words)

Magnesium Diboride In addition, magnesium diboride is considered to solve most of the problems associated with the HTS materials. The major difficulties in the deposition work are due to the high volatility of magnesium and its tendency to form amorphous MgO with even tiny amounts of oxygen. Magnesium diboride wires are typically produced by the well-known Powder-In-Tube (PIT) method (the principle of the technique is described in page www.tkk.fi /Units/AES/projects/prlaser/diboride.htm   (388 words)

physicistsdevelop Their research, although in its earliest stages, may lead to magnesium diboride becoming the preferred low-temperature superconductor for applications such as high-field magnets used in magnetic resonance imaging machines. Magnesium diboride has been known to scientists for approximately 50 years, however, no one had ever investigated superconductivity in the material – whether it could conduct electrical current perfectly, without resistance, when cooled to temperatures near absolute zero. The researchers discovered that the magnesium diboride wire segments have as sharp and as high a superconducting transition temperature as the powders they developed and that the wires are at least 80 percent dense. www.ameslab.gov /news/release/superconducting.htm   (983 words)

Magnesium diboride - Encyclopedia, History, Geography and Biography   (Site not responding. Last check: 2007-10-13) This page was last modified 19:00, 5 October 2005. This encyclopedia, history, geography and biography article about Magnesium diboride contains research on Magnesium diboride, External link, Borides, Magnesium compounds and Superconductors. www.arikah.net /encyclopedia/Magnesium_diboride   (192 words)

Explaining Superconductivity In Magnesium Diboride January's discovery of high-temperature superconductivity in magnesium diboride, a common laboratory compound, has set scientists scrambling to understand the phenomenon, said physicist Warren Pickett of the University of California, Davis. On Jan. 10 this year, Japanese scientist Jun Akimitsu announced that magnesium diboride became superconducting at minus 389 F. As well as being relatively cheap, magnesium diboride is a metal which seems to have encouraging properties for some applications, said Pickett. After hearing of the discovery, Pickett's lab began to model the behavior of magnesium diboride crystals, which are made up of alternating layers of magnesium and boron atoms. unisci.com /stories/20012/0423014.htm   (335 words)

ASC 2004: Technical Program   (Site not responding. Last check: 2007-10-13) We present a new route for making magnesium diboride containing powder which can be used directly for both in situ and ex situ PIT wire production. Because magnesium diboride is a conventional metallic conductor, we present for the first time real-time conductivity measurements during the reaction-sintering process. This further accelerates the commercialisation of magnesium diboride superconductors. www.ascinc.org /asc04/Format.asp?paperNumber=5MH07&Category=2   (250 words)

Science News: Run-of-the-mill compound becomes superstar - magnesium diboride - Brief Article The scientists, who formed magnesium diboride wires, observed the isotope effect typical of conventional superconductors. When they made magnesium diboride containing a light form, or isotope, of boron, its critical temperature rose 1 K. The prospect that magnesium diboride may be the first of a line of inexpensive, easily processed superconductors with yet higher critical temperatures is fueling the excitement. Nonetheless, new reports on magnesium diboride are pouring in to scientific journals and the on-line physics preprint server on the Internet (http://xxx.lanl.gov). findarticles.com /cf_dls/m1200/9_159/71569337/p1/article.jhtml   (633 words)

Advanced Ceramics Report: Magnesium diboride leads superconductors towards higher critical temperatures.@ HighBeam ...   (Site not responding. Last check: 2007-10-13) Magnesium diboride leads superconductors towards higher critical temperatures. A team of Japanese physicists claims to have produced a superconductor from a cheap metallic compound that is capable of operating at a record-high critical temperature (Tc) for such a material. Magnesium dibromide is a cheap compound available in bulk powder at most chemical supply outlets. static.highbeam.com /a/advancedceramicsreport/april012001/magnesiumdiborideleadssuperconductorstowardshigher/index.html   (206 words)

Magnesium diboride at the double (May 2003) - News - PhysicsWeb Magnesium diboride consists of hexagonal planes of boron atoms separated by planes of magnesium atoms, with the magnesium centred above and below the boron hexagons (see figure). This structure is very similar to that of graphite: each carbon atom – which has four valence electrons – is bonded to three others and occupies all planar bonding states (the sigma bands). As the superconductivity of magnesium diboride is bulk in nature, the researchers conclude that the sigma band is dominant. physicsweb.org /article/news/7/5/1   (362 words)

Carbon-doped Magnesium Diboride Superconductors Withstand Higher Magnetic Fields The image is a cross section of a 5 percent carbon-doped wire taken with polarized light. The work may one day ease the expense associated with current superconducting materials that generate the intense magnetic fields required for such applications as magnetic resonance imaging for medical diagnostics, high-field magnets for research, and superconducting magnets for particle accelerators. Magnesium diboride’s unexpected superconducting capabilities brought speculation about the material’s potential for replacing niobium-tin superconductors in various applications and thus reducing the expense of those technologies. www.physlink.com /News/062804Superconductors.cfm   (1054 words)

Superconductivity in Magnesium Diboride is made of alternating planes of boron and magnesium atoms aligned parallel to one another, these holes are expected to interact more easily within the planes than between adjacent planes. The embedded image (top left) is a model of the structure, showing the expected positions of the atoms and the distance between two magnesium planes. Said Tafto, “As we gain more understanding of the properties of magnesium diboride at the atomic level, I am confident that, in the near future, we will be able to relate them to macroscopic properties such as superconductivity — and maybe explain the origin of superconductivity in general.” www.bnl.gov /bnlweb/pubaf/pr/2002/bnlpr061702.htm   (737 words)

Physicists Hail Magnesium Diboride—Superconducting Superstar utting-edge physics makes a step change this period, as hot papers on the physics of extra dimensions move off the radar screen to be replaced by the new superconductor magnesium diboride. To be fair, although #8 is the first paper on wires to get into the Top Ten, several other groups are now reporting on the fabrication of wires, tapes, and films as the race to commercial applications gets underway in earnest. Magnesium diboride really does show all the signs of being a dream material for carrying high electrical currents. www.sciencewatch.com /may-june2002/sw_may-june2002_page6.htm   (863 words)

ElectronicsWeekly.com - Low-cost superconductor magnesium diboride meets commercial-scale needs   (Site not responding. Last check: 2007-10-13) Magnesium diboride could bring superconductivity to large-scale commercialapplications: It has its limits, but these are far outweighed by its low cost. It is to seek ?300,000 funding this autumn. The scientific community was amazed in January 2001 when researchers from a small Japanese university showed the well known chemical magnesium diboride was a superconductor at 20K. www.electronicsweekly.com /Article30101.htm   (464 words)

Synthesis of superconducting magnesium diboride objects   (Site not responding. Last check: 2007-10-13) A рrосess to create magnesium diboride objects frоm boron objects with a alike form is presented. Boron objects аre reacted with magnesium vapor at a рredetermined time and temperаture to form magnesium diboride objects whiсh hаs a morphology alike to the boron оbjeсt's initial morphology. Un processo per produrre gli oggetti di diboride del magnesio dagli oggetti del boro con una forma simile è presentato. www.patentalert.com /docs/530/z53014262.shtml   (150 words)

Magnesium diboride: one year on (January 2002) - Physics World - PhysicsWeb Last January physicists discovered that an innocuous compound that had been sitting on the shelf for decades was, in fact, a record-breaking intermetallic superconductor. For the first few months of 2001, groups all over the world raced to understand the properties of a new intermetallic superconductor. Superconductivity at 39 K in magnesium diboride (restricted access) Nature 410 63 www.physicsweb.org /article/world/15/1/10   (429 words)

Magnesium-Diboride Superconductor Magnesium diboride (MgB2) becomes superconducting at 39 degrees Kelvin, one of the highest known transition temperatures (Tc) of any superconductor. Like high-Tc superconductors made of cuprate ceramics, MgB2 is a layered material; while undoped cuprates are insulators at ordinary temperatures, however, MgB2 is always a metal. "Structurally, magnesium diboride is almost as simple as pencil lead, graphite," says Louie. superconductors.org /39K.htm   (1281 words)

Wires stay current But there is one key drawback to magnesium diboride. For magnesium diboride, this approach is complicated by the fact that magnesium reacts with several common metals, such as copper or nickel. Making wires of magnesium diboride and giving it greater resilience to magnetic fields could see the promising superconductor put to practical use. www.mindswap.org /2002/nature/010531-10.xml   (447 words)

Magnesium diboride Researchers at Los Alamos National Laboratory have found a way to make magnesium diboride (MgB2) superconducting wires that could be used in magnectic imaging resonance (MRI) machines. Magnesium Diboride’s (MgB2) Superconducting Properties Enhanced by Doping with Carbon Atoms - News By doping magnesium diboride (MgB2) with carbon atoms researchers at the Ames Laboratory have succeeded in doubling the magnetic field the material can withstand. www.azom.com /SearchResults.asp?MaterialKeyWord=Magnesium+diboride   (153 words)

Advanced Materials & Processes: Magnesium diboride wires made in 100 meter lengths. (Materials Science/R&D).   (Site not responding. Last check: 2007-10-13) Advanced Materials and Processes: Magnesium diboride wires made in 100 meter lengths. Magnesium diboride wires made in 100 meter lengths. Magnesium diboride superconducting wire has reportedly been fabricated in 100 meter lengths by Hyper Tech Research, Inc., Troy, Ohio. calbears.findarticles.com /p/articles/mi_go2212/is_200210/ai_n7094846   (138 words)

New insight into origin of superconductivity in magnesium diboride Also, because MgB2 is made of alternating planes of boron and magnesium atoms aligned parallel to one another, these holes are expected to interact more easily within the planes than between adjacent planes. The results agree with the theoretical predictions by showing that interactions between holes in the boron planes do occur in MgB2, and that superconductivity stems from such interactions. Said Tafto, "As we gain more understanding of the properties of magnesium diboride at the atomic level, I am confident that, in the near future, we will be able to relate them to macroscopic properties such as superconductivity -- and maybe explain the origin of superconductivity in general." www.eurekalert.org /pub_releases/2002-06/dnl-nii061702.php   (695 words)

Magnesium Diboride Superconductors (MGB2) - Interview with Dr. Paul C. Canfield Magnesium Diboride Superconductors (MGB2) - Interview with Dr. Paul C. Canfield n our Special Topics analysis of magnesium diboride research, Dr. Paul C. Canfield’s work places him among the most-cited scientists publishing in this field over the past decade, with 16 papers cited a total of 247 times. Canfield is also a contributing author on the papers ranked at #2, #4, and #5 in our survey. www.esi-topics.com /mgb2/interviews/DrPaulCCanfield.html   (1251 words)

Magnesium diboride hot pressed superconductors - Magnesium . com - News Room The three bears would have understood superconductors — some are too hot, others too cold, and one is just right to slash the cost of MRI machines. Feb 14.04 Paper: Effect of magnesium content on microstru... Feb 15.04 Queensland Premier backs AMC magnesium plant de... www.magnesium.com /w3/news-room/news_open.php?news=1663   (223 words)

U.S. Pregrant 20040186023 - Superconducting magnesium diboride thin film and method and apparatus for fabricating the ...   (Site not responding. Last check: 2007-10-13) A superconducting magnesium diboride (MgB2) thin film having c-axial orientation and a method and apparatus for fabricating the same are provided. The fabrication method includes forming a boron thin film on a substrate and thermally processing the substrate on which the boron thin film is formed along with a magnesium source and cooling the resulting structure. The superconducting magnesium diboride thin film can be used in a variety of electronic devices employing superconducting thin films, such as precision medical diagnosis equipment using superconducting quantum interface devices (SQUIDs) capable of sensing weak magnetic fields, microwave communications equipment used for satellite communications, and Josephson devices. cxp.paterra.com /uspregrant20040186023.html   (263 words)

Synthesis of magnesium diboride by magnesium vapor infiltration process (MVIP) Synthesis of magnesium diboride by magnesium vapor infiltration process (MVIP) A process of prepаring superconducting magnesium diboride powder by heating an admixture of delay magnesium and amorphous boron powder оr peIIet below an inert atmosphere in a Mg:B rаtio of superior thаn concerning 0.6:1 at temperаtures and for time adequate to form supposed superconducting magnesium diboride. Процесс подготовлять superconducting порошок diboride магния путем нагревать примесь твердого магния и аморфический порошок бора или лепешку под инертной атмосферой в коэффициенте Mg:B greater than около 0.6:1 на температурах и на время достаточно для того чтобы сформировать сказанное superconducting diboride магния. www.patentalert.com /docs/000/z00059092.shtml   (170 words)

Magnesium Diboride   (Site not responding. Last check: 2007-10-13) A study of the electronic structure and the effects of oxygen on the superconducting properties of magnesium diboride by electron energy loss spectroscopy : (Dissertation) An investigative study of local variations in electrical properties of superconducting magnesium diboride thin films with variable-temperature scanning... Reuters - Brain lesions known as neurofibrillary tangles, such as those seen in Alzheimer's disease, are also associated with impaired gait in older subjects with or without dementia, according to a postmortem study. www.dietarysodium.info /info/Magnesium-Diboride   (424 words)

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