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| the characterisitic of an element being able to exist in more than one crystal structure depending on temperature and pressure |
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| materials including glass that have no long-range order, or crystal structure |
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| having different properties in different directions |
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| fourteen possible lattices that can be created using lattice points (show location of atoms) |
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| directions in a crystal along which atoms are in contact |
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| the number of nearest neighbors to an atom in its atomic arrangement (speaks to how efficiently packed a unit cell is) |
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| the arrangement of atoms in a material into a regular repeatable lattice |
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| the generic size and shape of a unit cell, include cubic, tetragonal, orthorhombic, hexagonal, monoclinic, rhombohedral and triclinic |
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| materials that have long range order (composed of many small grains or crystals) |
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| a microstructural feature representing a disruption in the periodic arrangment of atoms/ions in a crystalline material. |
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| crystallographic directions that all have the same characteristics although their sense is different, generic directions, denoted by < > |
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| solid, non-crystalline materials that have only short range atomic order (amorphous) |
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| small crystal in a polycrystalline material |
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| regions between grains of a polycrystalline material |
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| locations between the normal atoms or ions in a crystal into which another usually different atom or ion is placed, typically the size of the interstitial location is smaller than the atom or ion that is to be introduced |
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| having the same properties in all directions |
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| a collection of points that divide space into smaller equally sized segments |
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| the lengths of sides of the unit cell and the angles between those sides, describe the size and shape of the unit cell |
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| the number of lattice points per unit length along a direction |
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| shorthand notation to describe crystallographic planes and directions |
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| the fraction of a direction or plane that is actually covered by atoms or ions, speaks to how efficiently packed a unit cell is in a direction or on a plane |
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| the number of atoms per unit area whose centers lie on the plane |
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| crystallographic planes that all have the same cahracteristics even though their orientations are different; denoted by { } |
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| material composed of many grains |
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| compounds exhibiting more than one type of crystal structure (similar to allotropic) |
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| the distance from one lattice point to the adjacent lattice point along a direction |
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| the regular and predictable arrangement of atoms over short distances usually one or two atom spacings only |
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| the sequence in which close-packed planes are stacked, if the stacking sequence is ABABABAB a HCP structure is produced, if a stacking sequence of ABCABCABC then an FCC structure is produced |
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| a subdividion of the lattice that still retains the overall cahracteristics of the entire lattice |
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