Crystal structure
hideIn mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a motif, a set of atoms arranged in a particular way, and a lattice. Motifs are located upon the points of a lattice, which is an array of points repeating periodically in three dimensions. The points can be thought of as forming identical tiny boxes, called unit cells, that fill the space of the lattice. The lengths of the edges of a unit cell and the angles between them are called the lattice parameters. The symmetry properties of the crystal are embodied in its space group. A crystal's structure and symmetry play a role in determining many of its properties, such as cleavage, electronic band structure, and optical properties.
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News tagged with crystalline structure
Quantum gas microscope offers glimpse of quirky ultracold atoms
Nov 04, 2009 |
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(PhysOrg.com) -- Physicists at Harvard University have created a quantum gas microscope that can be used to observe single atoms at temperatures so low the particles follow the rules of quantum mechanics, ...
University lab demonstrates 3-D printing in glass
Sep 24, 2009 |
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A team of engineers and artists working at the University of Washington's Solheim Rapid Manufacturing Laboratory has developed a way to create glass objects using a conventional 3-D printer. The technique ...
Engineers produce 'how-to' guide for controlling the structure of nanoparticles
Nanotechnology / Nanomaterials
Sep 24, 2009 |
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Tiny objects known as nanoparticles are often heralded as holding great potential for future applications in electronics, medicine and other areas. The properties of nanoparticles depend on their size and structure. Now researchers ...
Magnetism observed in gas for the first time
Sep 17, 2009 |
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(PhysOrg.com) -- For the first time, MIT scientists have observed ferromagnetism in an atomic gas, addressing the decades-old question of whether gases could show properties similar to a magnet made of iron or nickel. Specifically, ...
Engineers Produce 'How-To' Guide for Controlling the Structure of Nanoparticles
Nanotechnology / Nanomaterials
Sep 16, 2009 |
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(PhysOrg.com) -- Tiny objects known as nanoparticles are often heralded as holding great potential for future applications in electronics, medicine and other areas. The properties of nanoparticles depend on their size and ...
Cement's basic molecular structure finally decoded
Nanotechnology / Nanomaterials
Sep 09, 2009 |
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(PhysOrg.com) -- In the 2,000 or so years since the Roman Empire employed a naturally occurring form of cement to build a vast system of concrete aqueducts and other large edifices, researchers have analyzed the molecular ...
New method uses electrolyzed water for more efficient fuel production
Jul 27, 2009 |
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Using electrolyzed water rather than harsh chemicals could be a more effective and environmentally friendly method in the pretreatment of ethanol waste products to produce an acetone-butanol-ethanol fuel mix, ...
California's Channel Islands hold evidence of Clovis-age comets
Space & Earth / Earth Sciences
Jul 20, 2009 |
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A 17-member team has found what may be the smoking gun of a much-debated proposal that a cosmic impact about 12,900 years ago ripped through North America and drove multiple species into extinction.
Discovery of Current Spike Phenomenon in Semiconductor Materials Leads to New Understanding of Nanoscale Plasticity
Mar 31, 2009 |
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Plasticity in certain semiconductor materials at the nanoscale is actually linked to phase transformation rather than dislocation nucleation, as previously thought. This is shown by the results of an international research ...
Deep-sea rocks point to early oxygen on Earth
Space & Earth / Earth Sciences
Mar 24, 2009 |
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Red jasper cored from layers 3.46 billion years old suggests that not only did the oceans contain abundant oxygen then, but that the atmosphere was as oxygen rich as it is today, according to geologists.
Researchers See Complex Atomic Choreography as Crystals Melt
Feb 02, 2009 |
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(PhysOrg.com) -- Conga lines of atoms wend their way through a crystal, their numbers growing as more and more atoms join the migration. The worm-like lines of atoms randomly converge, forming tangles that ...
