A team of researchers has reported possible evidence for a new category of solids, things that are neither pure glasses, crystals, nor even exotic quasicrystals.
Q-glass, a new solid alloy that has been discovered in a rapidly cooled mixture of aluminum, iron and silicon, is neither a pure glass, a crystal, nor even a quasicrystal, according to a team of researchers from the National Institute of Standards and Technology (NIST) and Argonne National Laboratory.
The solids catalog used to be pretty straightforward. Solid stuff was either a crystal or a glass. Crystals fill up space with atoms or molecules in specific, fairly rigid patterns. The positions of the atoms are fixed such that if you take any section of pure crystal and slide it up, down, in, out or sideways a given distance, it will fit perfectly in the new position. That's translational symmetry. You can also spin the crystal through certain angles and the atoms also will line up; that's rotational symmetry.
Glasses have neither symmetry. They're just a random arrangement of their components, as if you'd taken a liquid and suddenly frozen everything in place without giving the atoms a chance to get in order. Which, in fact, is how metallic glasses are made.
In the 1980s, Dan Shechtman, an Israeli then working at NIST as a guest researcher, shook up this paradigm by finding evidence for quasicrystals, a new category of solids in which the atomic composition is fixed, and the material has rotational symmetry, but weirdly not translational symmetry. There is no long-range order to the pattern of the atoms.
The new material, which the research team has provisionally dubbed a "q-glass," can be shown by X-ray diffraction to have neither rotational nor translational symmetry, just like a glass, says Levine, but regardless, the atomic arrangement apparently is not random. "As the nodule grows, every atom still knows where to go," he says.
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The odd microstructure of this aluminum-iron-silicon mixture is seen in this image. The round nodules are the q-glass, not crystalline but with a well-defined chemical composition. The spherical shape indicates that they grow from an initial seed. The nodules use up iron and silicon in the mixture until the surrounding concentration of aluminum gets high enough to start forming aluminum crystals, seen as long bright lines radiating from the nodules. (Color added for clarity.)
Credit: Bendersky/NIST
Physical Review Letters - Highly Ordered Noncrystalline Metallic Phase
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Q-glass, a new solid alloy that has been discovered in a rapidly cooled mixture of aluminum, iron and silicon, is neither a pure glass, a crystal, nor even a quasicrystal, according to a team of researchers from the National Institute of Standards and Technology (NIST) and Argonne National Laboratory.
The solids catalog used to be pretty straightforward. Solid stuff was either a crystal or a glass. Crystals fill up space with atoms or molecules in specific, fairly rigid patterns. The positions of the atoms are fixed such that if you take any section of pure crystal and slide it up, down, in, out or sideways a given distance, it will fit perfectly in the new position. That's translational symmetry. You can also spin the crystal through certain angles and the atoms also will line up; that's rotational symmetry.
Glasses have neither symmetry. They're just a random arrangement of their components, as if you'd taken a liquid and suddenly frozen everything in place without giving the atoms a chance to get in order. Which, in fact, is how metallic glasses are made.
In the 1980s, Dan Shechtman, an Israeli then working at NIST as a guest researcher, shook up this paradigm by finding evidence for quasicrystals, a new category of solids in which the atomic composition is fixed, and the material has rotational symmetry, but weirdly not translational symmetry. There is no long-range order to the pattern of the atoms.
The new material, which the research team has provisionally dubbed a "q-glass," can be shown by X-ray diffraction to have neither rotational nor translational symmetry, just like a glass, says Levine, but regardless, the atomic arrangement apparently is not random. "As the nodule grows, every atom still knows where to go," he says.
The odd microstructure of this aluminum-iron-silicon mixture is seen in this image. The round nodules are the q-glass, not crystalline but with a well-defined chemical composition. The spherical shape indicates that they grow from an initial seed. The nodules use up iron and silicon in the mixture until the surrounding concentration of aluminum gets high enough to start forming aluminum crystals, seen as long bright lines radiating from the nodules. (Color added for clarity.)
Credit: Bendersky/NIST
Physical Review Letters - Highly Ordered Noncrystalline Metallic Phase
Read more »
