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# Kristalle | ||
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## Einheitszelle | ||
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![](../../Figures/einheitszelle.png) | ||
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| Kristallsystem | Gitterkonstanten | Achswinkel | Beispiele | | ||
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| triklin | a0 ≠ b0 ≠ c0 | α ≠ β ≠ γ ≠ 90° | Silikat-Minerale | | ||
| monoklin | a0 ≠ b0 ≠ c0 | α = γ = 90°; β ≠ 90° | Mo2S3; β-Pu | | ||
| (ortho)rhombisch | a0 ≠ b0 ≠ c0 | α = β = γ = 90° | U, S, P, Ga, γ-Sn | | ||
| rhomboedrisch | a0 = b0 = c0 | α = β = γ ≠ 90° | As, Hg, Sb | | ||
| hexagonal | a0 = b0 ≠ c0 | α = β = 90°; γ = 120° | α-Ti, Mg, Zn | | ||
| tetragonal | a0 = b0 ≠ c0 | α = β = γ = 90° | B, CuTi3, Sn (T>13,5°) | | ||
| kubisch | a0 = b0 = c0 | α = β = γ = 90° | Cu, Al, Ni, Au, Ag; γ-Eisen (kfz); α-Eisen, V, Cr, W (krz); Mn, Po (kp) | | ||
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--- | ||
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**Zahl der Atome pro Elementarzelle (EZ)** Diese kann sich deutlich unterscheiden, siehe kubisch raumzentriert oder kubisch flächenzentriertes Gitter. | ||
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**Koordinationszahl** beschreibt die Zahl der Atome, die sich im kürzesten und gleichen Abstand von einem wählbaren Zentralatom befinden. | ||
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**Packungsdichte** beschreibt, inwieweit eine Elementarzelle tatsächlich mit dem Volumen der Atome ausgefüllt ist. Sie ist das Volumen der Atomsegmente in der Elementarzelle bezogen auf das Volumen der Elementarzelle selbst. | ||
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## Kristallarten | ||
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## Korngrenzen |
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