Magnetic Materials - Superconductors superconductors. Table 4. Critical temperatures of some superconductors. Compoundor Element, T C (K), Compound or Element, T C (K). Mercury, 4, Nb 3 Sn, 18. http://www.sigmaaldrich.com/Area_of_Interest/Organic___Inorganic_Chemistry/Mater
Extractions: Superconductors Superconductors are materials which exhibit no electrical resistance below a certain temperature defined as the critical temperature ( T C ). Prior to 1986, the highest T C reported was 20 K for Nb Ge and Nb Sn. 2-x Ba x CuO 4-x and YBa Cu O (Aldrich product ) superconduct above the boiling point of nitrogen (77 K). Materials whose T C Other more exotic compounds such as fullerides have also exhibited superconducting properties. Fullerides of the formula A x @C (A = K, Rb, Cs) are reported to have superconducting character. Although superconductive compounds have been known for nearly a century, the relatively mundane compound magnesium boride has only recently been demonstrated to exhibit superconductivities. Magnesium boride, MgB (Aldrich product ) is not only superconductive but its critical temperature is surprisingly high for a simple ceramic material (T c = 39 K).
Howstuffworks "What Is Superconductivity?" The following table shows the critical temperatures of various superconductors Howdo electrons travel through superconductors with no resistance? http://www.howstuffworks.com/question610.htm
Extractions: Superconductivity is a phenomenon observed in several metals and ceramic materials. When these materials are cooled to temperatures ranging from near absolute zero (-459 degrees Fahrenheit, degrees Kelvin, -273 degrees Celsius) to liquid nitrogen temperatures (-321 F, 77 K, -196 C), they have no electrical resistance. The temperature at which electrical resistance is zero is called the critical temperature T c ) and varies with the individual material. For practical purposes, critical temperatures are achieved by cooling materials with either liquid helium or liquid nitrogen. The following table shows the critical temperatures of various superconductors: Material Type T c (K) Zinc metal Aluminum metal Tin metal Mercury metal YBa Cu O ceramic TlBaCaCuO ceramic Because these materials have no electrical resistance, meaning electrons can travel through them freely, they can carry large amounts of electrical current for long periods of time without losing energy as heat. Superconducting loops of wire have been shown to carry electrical currents for several years with no measurable loss. This property has implications for
Springer-Verlag - Condensed Matter Vortices in Unconventional superconductors and Superfluids SeriesSpringer Series in SolidState Sciences, Vol. 132 Huebener, RP http://www.springeronline.com/sgw/cda/frontpage/0,10735,5-109-22-2167156-0,00.ht
Extractions: Select a discipline Biomedical Sciences Chemistry Computer Science Engineering Environmental Sciences Geosciences Law Life Sciences Materials Mathematics Medicine Statistics preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900120-0,00.gif'); preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900180-0,00.gif'); preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900170-0,00.gif'); preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900190-0,00.gif'); preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900200-0,00.gif'); preloadImage('/sgw/cda/pageitems/designobject/cda_displaydesignobject/0,10885,5-0-17-900160-0,00.gif');
Superconductors Page Products Services / Products by Industries / superconductors, Printer FriendlyPage. superconductors. Contact us sales.superconductors@outokumpu.com. http://www.outokumpu.com/template/Page____7084.asp
Science, Technology, Materials: Superconductors Provides links to web resources on all aspects of superconductors, including researchand development, applications, producers, education and public policy. http://www.combose.com/Science/Technology/Materials/Superconductors/
Extractions: Top Science Technology Materials ... Electricity Generation Related links of interest: Science:Physics:Condensed Matter A Directory of Superconductor Resources on the Web. - Provides links to web resources on all aspects of superconductors, including research and development, applications, producers, education and public policy. A Roadmap for Superconducting Electronic Devices in Europe - A 1998 paper which is"a review of the opportunities available and the concerted actions required to ensure that Europe remains internationally competitive in the future development and commercialisation of Superconducting Electronics."By Colin Gough. ARS Associates: Instruments and systems for superconductivity - ARS Associates is a manufacturer's representative in the fields of cryogenics, vacuum / eemiconductor process equipment, and superconductivity, including superconducting magnets, instrumentation, and cryostats. In Allentown, PA. Acroscape - Acroscape's research on superconducting materials focuses on the development of materials and manufacturing processes for the superconducting wires that have a high potential for improved conductor performance and low fabrication costs. American Magnetics, Inc.
E2TAC Technology Thrusts - Next Generation Superconductors High temperature superconductors based on YBCO has significant commercial opportunitysince operation at temperatures above liquid nitrogen are now possible. http://www.e2tac.com/technology/superconductor.cfm
Extractions: June 12, 2004 technology thrusts photovoltaics fuel cells superconductors ... infrastructure and facilities High temperature superconductors based on YBCO has significant commercial opportunity since operation at temperatures above liquid nitrogen are now possible. HTS conductor can save up to 20 % of electrical output that is currently lost in transmission due to resistance. It also has applications in motors, generators, transformers and fault current limiters. However, the critical current and current density must be increased, while cost needs to be reduced before YBCO will be a cost-effective replacement for conventional materials. E2TAC is focused on improving superconductors. Superconductor Technology Development Areas: Process Optimization of Metal-Organic Chemical Vapor Deposition Physical (sputtering and ISD) for buffer and intermediate layers Modeling superconductor deposition Low ac loss coated conductor Characterization Non-destructive, XRD, FE-SEM, RBS, AFM
Superconductors sources, evaporation materials, single crystal substrates, and engineered ceramicsfor research and commercial applications of superconductors, solid oxide http://www.electronics-ee.com/Energy_and_environment/Energy_storage/Superconduct
Extractions: Scientific teams ... Persons working on the topic This high critical temperature superconductor, YBa Cu O 6+x is studied in the laboratory along with a number of other oxide superconductors. The CuO planes, in grey, are responsible for most of the exotic properties of these materials: an order parameter with d-wave symmetry, anomalous metallic behaviour, vortices, etc. Measurements and theory concern magnetic, transport and structural properties, not only of the superconducting state but also of normal and mixed states. Non magnetic impurities produce unexpected effects, in the normal metal state of a high critical temperature superconductor. When a zinc or lithium atom is substituted to copper in the CuO planes, it induces magnetic moments in its vicinity (left). The magnetism of the planes is thus affected in an alternate way, reminiscent of the RKKY effect in metals, or Friedel's oscillations (right). This effect is quite unexpected, since zinc or lithium in a metal do not yield magnetic effects. By the way, the shape of the alternate polarisation differs from that of a metal. One can detect the induced magnetic moments by using Nuclear Magnetic Resonance, which is sensitive to the long-distance effect of these moments. The metallic phase of high-
Combined ESF Vortex And ESF PiShift Workshop 2004 The Joint International Workshop on Nanostructured superconductorsFrom fundamentals to applications May 1. http://www.fz-juelich.de/conference/esf-workshop
Extractions: CCAS is a coalition of companies with a shared vision of the important role superconductivity can play in our modern world. Whether involved as manufacturers, developers, in research or the use of these materials, CCAS members believe that commercialization of superconductivity will translate into significant benefits to our nation's economy and society in a wide range of fields. Superconductivity offers the promise of important benefits in the form of increased energy efficiency, reduced environmental impact, lower systems cost, higher productivity and improved scientific understanding. CCAS members are involved in applying these materials in such diverse fields as the production, delivery and use of electricity; medicine; transportation; communications; and laboratory research on the frontiers of human knowledge. About CCAS About Superconductivity Industry News
Apollon: Watching Superconductors Becoming Super Magnets Watching superconductors becoming super magnets. superconductors are materialsthat can transport electricity without resistance and loss of energy. http://www.apollon.uio.no/2003_4/english/supercond.shtml
Extractions: Superconductors are materials that can transport electricity without resistance and loss of energy. But superconductors can also become extremely powerful magnets. Tom Henning Johansen and his collaborators are the only research group in the world to have developed an optical method for seeing how magnetic flux penetrates the superconductor and become trapped. UNIQUE APPARATUS: This is a picture of the magnetic field as it suddenly penetrates the material magnesium diboride, a superconductor sensationally discovered in 2001. For practical applications the formation of beautiful magnetic trees of this kind is undesirable, a discovery that was made by the researchers at the University of Oslo two years ago, and they have now succeeded in controlling the phenomenon. Professor Johansen and his collaborators have specialised in studying the behaviour of the flux lines in the superconductor. They have themselves developed a magneto-optical microscope with which it is possible to directly see these lines as they penetrate the superconductor and become pinned inside. This experimental facility at the University of Oslo is unique in the world.
Extractions: Early in the 20th century, Dutch physicist Heike Kamerlingh Onnes observed that mercury displayed no electrical resistance when cooled to very low temperatures. With this observation, the study of superconductivity was born. For the next several decades, superconductors remained a scientific curiosity with few practical applications. Then in the 1960s a practical superconducting metal wire made of niobium and tin was developed. That wire, later made of a niobium and titanium alloy, became the basis for the first applications of superconductors. The niobium and titanium alloy, still in use today, is among the materials called low-temperature superconductors. Low-temperature superconductors must be cooled to below 20 Kelvin (K) (-253 o Celsius [C]) in order to become superconducting. They are now widely used in magnetic resonance imaging, or MRI, machines, and in the fields of high-energy physics and nuclear fusion. Additional commercial use has been limited largely by the high refrigeration costs associated with liquid helium, which is needed to cool the materials to such low temperatures. o o C). This discovery was particularly significant because this compound could be cooled with cheap and readily available liquid nitrogen. These new materials were dubbed high-temperature superconductors.
Nb3Sn Superconductors Nb3Sn superconductors. OST is the world leader in Nb3Sn production,most commonly used in magnets with field 10 Tesla. We make http://www.oxinst.com/OSTPDP334.htm
Commercial Crystal Laboratories Inc Ceramics and Optics superconductors. Custom slicing and polishing serviceson a custom or production basis. We cuts. superconductors. http://search.ugenius.com/superconductors-a.html
Extractions: Tel: 239-643-5959 " A History of Growing Scientific Crystals Since 1948 " guru@crystalguru.com On-line Catalog Awards Products ... PhotoGallery Inventory of thousands of One-Of-A-Kind Oddity Crystals Catalog SEE OUR PHOTO GALLERY: IN THE NEXT FEW DAYS THIS SITE WILL BE UPGRADED TO INCLUDE MANY NEW ADDITIONS, PRODUCTS AND INFORMATION ABOUT THE SERVICES COMMERCIAL CRYSTAL LABS OFFERS. IN PARTICULAR, LOOK FOR RARE, STRANGE AND UNUSUAL CRYSTALS AND SUBSTRATES THAT WE HAVE IN INVENTORY. PLEASE VISIT THIS SITE OFTEN FOR THESE UPDATES. If you are interested in a bit of history . Just after world War II, Commercial Crystal Labs, then a division of National Lead Company (now N. L. Industries), began growing single crystal Rutile. One of the Companys major products was titanium dioxide for use as white pigment for paint products and the Rutile Crystal was used to extensively investigate the chemical and physical properties of these titanium dioxide pigments. For the next decade or so, Commercial Crystal Labs experimented with the synthesis of new and novel titanium oxide containing compounds and the crystallization thereof. This ensuing research resulted in a number of
Science Search > Superconductors Home. Current location Technology Materials superconductors, 2.superconductors.org Superconductor Information for the Beginner. http://www.science-search.org/index/Technology/Materials/Superconductors/
Materials Chemistry - Superconductors superconductors are also perfectly diamagnetic (ie they repel a magnetic field);this property was discovered in 1933 and named the Meissner effect. http://imr.chem.binghamton.edu/labs/super/superc.html
Extractions: Figure 1. Electrical resistance of a superconductor. Superconductors are also perfectly diamagnetic (i.e. they repel a magnetic field); this property was discovered in 1933 and named the Meissner effect This compound is often called the 1 2 3 material from the molar ratios of Y:Ba:Cu. The heating-cooling synthesis sequence is shown graphically in figure 2.
APPLICATIONS OF SUPERCONDUCTORS APPLICATIONS OF superconductors. As you can see application of superconductorsis only just beginning. APPLICATIONS OF superconductors. http://www.physnet.uni-hamburg.de/home/vms/reimer/htc/pt4.html
Extractions: Soon after Kamerlingh Onnes discovered superconductivity, scientists began dreaming up practical applications for this strange new phenomenon. Powerful new superconducting magnets could be made much smaller than a resistive magnet,because the windings could carry large currents with no energy loss. Generators wound with superconductors could generate the same amount of electricity with smaller equipment and less energy. Once the electricity was generated it could be distributed through superconducting wires. Energy could be stored in superconducting coils for long periods of time without significant loss. The recent discovery of high temperature superconductors brings us a giant step closer to the dream of early scientists. Applications currently being explored are mostly extensions of current technology used with the low temperature superconductors. Current applications of high temperature superconductors include; magnetic shielding devices, medical imaging systems, superconducting quantum interference devices (SQUIDS), infrared sensors, analog signal processing devices, and microwave devices. As our understanding of the properties of superconducting material increases, applications such as; power transmission, superconducting magnets in generators, energy storage devices, particle accelerators, levitated vehicle transportation, rotating machinery, and magnetic separators will become more practical. The ability of superconductors to conduct electricity with zero resistance can be exploited in the use of electrical transmission lines. Currently, a substantial fraction of electricity is lost as heat through