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Quantum mechanics predicts unusual lattice dynamics of vanadium metal under high pressure
October 12, 2007A Swedish research team of Dr. Wei Luo & Professor Rajeev Ahuja and US team of Dr. Y. Ding & Prof. H.K. Mao have used theoretical calculations to understand a totally new type of high-pressure structural phase transition in Vanadium. This phase was not found in earlier experiments for any element and compound. The findings are being published in this week's Net edition of Proceedings of the National Academy of Science, PNAS.
The relation between electronic structure and the crystallographic atomic arrangement is one of the fundamental questions in physics, geophysics and chemistry. Since the discovery of the atomic nature of matter and its periodic structure, this has remained as one of the main questions regarding the very foundation of solid systems.
Scientists at Carnegie's Geophysical Laboratory, USA and Uppsala University, Sweden have discovered a new type of phase transition - a change from one form to another-in vanadium, a metal that is commonly added to steel to make it harder and more durable. Under extremely high pressures, pure vanadium crystals change their shape but do not take up less space as a result, unlike most other elements that undergo phase transitions. This work was appeared in the February 23, 2007 issue of Physical Review Letters.
Trying to understand why high-pressure vanadium uniquely has the record-high superconducting temperature of all known elements inspired us to study high-pressure structure of vanadium. Usually high superconductivity is directly linked to the lattice dynamics of material. In present paper in PNAS, again a collaboration between Uppsala University and Carnegie's Geophysical Laboratory, USA, we have looked in to the lattice dynamics of vanadium metal and it shows a very unusual behavior under pressure. A huge change in the electronic structure is driving force behind this unusual lattice dynamics. Moreover, our findings provide a new explanation for the continuous rising of superconducting temperature in high-pressure vanadium, and could lead us to the next breakthrough in superconducting materials.
Uppsala University
Trying to understand why high-pressure vanadium uniquely has the record-high superconducting temperature of all known elements inspired us to study high-pressure structure of vanadium. Usually high superconductivity is directly linked to the lattice dynamics of material. In present paper in PNAS, again a collaboration between Uppsala University and Carnegie's Geophysical Laboratory, USA, we have looked in to the lattice dynamics of vanadium metal and it shows a very unusual behavior under pressure. A huge change in the electronic structure is driving force behind this unusual lattice dynamics. Moreover, our findings provide a new explanation for the continuous rising of superconducting temperature in high-pressure vanadium, and could lead us to the next breakthrough in superconducting materials.
Uppsala University
Vanadium Current Events and Vanadium News RSSExposures to metals and diesel emissions in air linked to respiratory symptoms in children
Exposure shortly after birth to ambient metals from residential heating oil combustion and particles from diesel emissions are associated with respiratory symptoms in young inner city children.
Putting a Strain on Nanowires Could Yield Colossal Results
In finally answering an elusive scientific question, researchers with the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) have shown that the selective placement of strain can alter the electronic phase and its spatial arrangement in correlated electron materials.
Scientists Discover Magnetic Superatoms
A team of Virginia Commonwealth University scientists has discovered a 'magnetic superatom' - a stable cluster of atoms that can mimic different elements of the periodic table - that one day may be used to create molecular electronic devices for the next generation of faster computers with larger memory storage.
Nano-sandwich Triggers Novel Electron Behavior
A material just six atoms thick in which electrons appear to be guided by conflicting laws of physics depending on their direction of travel has been discovered by a team of physicists at the University of California, Davis. Working with computational models, the team has found that the electrons in a thin layer of vanadium dioxide sandwiched between insulating sheets of titanium dioxide exhibit one set of properties when moving in forward-backward directions, and another set when moving left to right.
Garlic chemical tablet treats diabetes I and II
A drug based on a chemical found in garlic can treat diabetes types I and II when taken as a tablet, a study in the new Royal Society of Chemistry journal Metallomics says.
Tracking Down the Menace in Mexico City Smog
A new report by scientists who are part of the international MILAGRO Campaign indicates that some of the most harmful air pollution in Mexico City may not come from motor vehicles but instead originates with industrial sources - and that the culprit may be garbage incineration.
Arctic pollution's surprising history
Scientists know that air pollution particles from mid-latitude cities migrate to the Arctic and form an ugly haze, but a new University of Utah study finds surprising evidence that polar explorers saw the same phenomenon as early as 1870.
Greenhouse gas burial
Deep coal seams that are not commercially viable for coal production could be used for permanent underground storage of carbon dioxide (CO2) generated by human activities, thus avoiding atmospheric release.
Under pressure, vanadium won't turn down the volume
Scientists at Carnegie's Geophysical Laboratory have discovered a new type of phase transition—a change from one form to another—in vanadium, a metal that is commonly added to steel to make it harder and more durable.
New fertilizer SRM can help control heavy metal content
A new reference material developed by the National Institute of Standards and Technology (NIST) can help the agriculture industry and state regulators monitor the concentrations of several potentially hazardous heavy metal contaminants in fertilizers.
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Source Naturals Vanadium With Chromium, 180 tablets (Pack of 2) by Source Naturals Dietary supplement. Helps maintain healthy blood sugar levels. Vanadium is a biologically important metal that is essential for normal cell function and development. Vanadium has been shown to help maintain blood - sugar levels that are in the normal rang |
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Albion Chelated Vanadium 5 mg 60 Caps by Swanson Ultra Vanadium is helpful for promoting healthy carbohydrate metabolism. Classified as a trace mineral because it is needed only in small amounts, each capsule contains 5 mg of chelated vanadium from Albion, the leaders in supplemental mineral chelates. Plus, it contains our proprietary blend of ginger root, Piper longum and Piper nigrum to promote absorption. |
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Now Foods True Balance, 120 Capsules by NOW True Balance from NOW is a multiple vitamin and mineral supplement formulated based on years of research and clinical experience. It provides a full complement of essential nutrients like Chromium and Vanadium. Important minerals that support energy production and cellular metabolism, and a full array of key B-complex vitamins that support a healthy mood state. This formula is Iron-Free, contains less than 2% fillers, and includes 100% natural BetatabTM as Beta Carotene. |
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Source Naturals Vanadium With Chromium, 180 tablets (Pack of 2) by Source Naturals Dietary supplement. Helps maintain healthy blood sugar levels. Vanadium is a biologically important metal that is essential for normal cell function and development. Vanadium has been shown to help maintain blood - sugar levels that are in the normal range by its insulin - like effects in the liver, skeletal muscle and adipose (fat that surrounds our organs) tissue. Chromium is a trace element that plays a significant role in helping to regulate the amount of glucose in the blood and maintain blood sugar and cholesterol levels that are in the normal range. Source Naturals Vanadium with Chromium helps to maintain healthy blood sugar levels when used as part of your diet (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose,... |
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Chromium & Vanadium (100mcg/25mcg) - 90 - Capsule by Natural Factors Chromium & Vanadium This combination of minerals is especially helpful for people with blood sugar difficulties as both minerals assist in glucose metabolism. Chromium & Vanadium have been reported to help those with Type II diabetes. Studies on chromium GTF and vanadium have proved so promising that Natural Factors has combined these nutrient into one convenient nutritional supplement. Chromium: is a component of a molecule called Glucose Tolerance Factor that regulates blood sugar levels, making it beneficial for both high and low blood sugar problems. The hormone insulin will not work without chromium. As a master hormone insulin regulates much more than blood sugar levels--it also controls fat, protein and energy metabolism, so any insulin imbalance... |
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Vanadium: Chemistry, Biochemistry, Pharmacology and Practical Applications by Alan S. Tracey (Author), Gail R. Willsky (Author), Esther S. Takeuchi (Author) The first comprehensive resource on the chemistry of vanadium, Vanadium: Chemistry, Biochemistry, Pharmacology, and Practical Applications has evolved from over a quarter century of research that concentrated on delineating the aqueous coordination reactions that characterize the vanadium(V) oxidation state. The authors distill information on biological processes needed to understand vanadium effects in biological systems and make this information accessible to a wide range of readers, including chemists without extensive biological training. Building a hierarchy of complexity, the book provides a discussion of some basic principles of 51V NMR spectroscopy followed by a description of the self-condensation reactions of vanadate itself. The authors delineate reactions with simple... |
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Vanadium Tribute by Fire Trails Featuring Pino Scotto & Lio Mascheroni (ex-Vanadium)/ Packaged in a thin booklet (DVD size). Underground Symphony. 2003. |
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PRATT-READ CHROME VANADIUM 33 PIECE SWIVEL DRIVER SET by American Science & Surplus Chrome Vanadium Swiveler Nearly extinct in the wild, be we've got a domesticated version for you. This high-quality driver can be locked in a straight position or will swivel 45° on a ball-socket tip. Storage space in the handle for (6) bits. Comes with (5) slotted bits, (5) Phillips, (4) torx, T10 to T30, #1, 2 and 3 square bits, (5) hex, 1/8" to 1/4", clutch bits at 5/32" and 3/16", and (5) 1/4" sockets from 1/4" to 1/2", plus adapters to extend the sockets and bits. They come in a molded, labeled carrying case for the meticulous user. From Pratt-Read Tools®. |
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Maxtech 17505MX 32 Piece Black Nickel Chrome-Vanadium Combination Wrench Set by Maxtech |
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STX Men's Vanadium Lacrosse Shaft for Defense - Platinum by STX Lacrosse |
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