Ca7Ge Structure: A7B_cF32_225_bd_a
| Prototype | : | Ca7Ge |
| AFLOW prototype label | : | A7B_cF32_225_bd_a |
| Strukturbericht designation | : | None |
| Pearson symbol | : | cF32 |
| Space group number | : | 225 |
| Space group symbol | : | $\mbox{Fm}\bar{3}\mbox{m}$ |
| AFLOW prototype command | : | aflow --proto=A7B_cF32_225_bd_a --params=$a$ |
Other compounds with this structure
- LiPt7, MoZn7
Face-centered Cubic primitive vectors:
\[
\begin{array}{ccc}
\mathbf{a}_1 & = & \frac12 \, a \, \mathbf{\hat{y}} + \frac12 \, a \, \mathbf{\hat{z}} \\
\mathbf{a}_2 & = & \frac12 \, a \, \mathbf{\hat{x}} + \frac12 \, a \, \mathbf{\hat{z}} \\
\mathbf{a}_3 & = & \frac12 \, a \, \mathbf{\hat{x}} + \frac12 \, a \, \mathbf{\hat{y}} \\
\end{array}
\]
Basis vectors:
\[ \begin{array}{ccccccc} & & \mbox{Lattice Coordinates} & & \mbox{Cartesian Coordinates} &\mbox{Wyckoff Position} & \mbox{Atom Type} \\ \mathbf{B}_{1} & = &0 \, \mathbf{a}_{1} + 0 \, \mathbf{a}_{2} + 0 \, \mathbf{a}_{3} & = &0 \mathbf{\hat{x}} + 0 \mathbf{\hat{y}} + 0 \mathbf{\hat{z}} & \left(4a\right) & \mbox{Ge} \\ \mathbf{B}_{2} & = &\frac12 \, \mathbf{a}_{1}+ \frac12 \, \mathbf{a}_{2}+ \frac12 \, \mathbf{a}_{3}& = &\frac12 \, a \, \mathbf{\hat{x}}+ \frac12 \, a \, \mathbf{\hat{y}}+ \frac12 \, a \, \mathbf{\hat{z}}& \left(4b\right) & \mbox{Ca I} \\ \mathbf{B}_{3} & = &\frac12 \, \mathbf{a}_{1}& = &\frac14 \, a \, \mathbf{\hat{y}}+ \frac14 \, a \, \mathbf{\hat{z}}& \left(24d\right) & \mbox{Ca II} \\ \mathbf{B}_{4} & = &\frac12 \, \mathbf{a}_{2}+ \frac12 \, \mathbf{a}_{3}& = &\frac12 \, a \, \mathbf{\hat{x}}+ \frac14 \, a \, \mathbf{\hat{y}}+ \frac14 \, a \, \mathbf{\hat{z}}& \left(24d\right) & \mbox{Ca II} \\ \mathbf{B}_{5} & = &\frac12 \, \mathbf{a}_{2}& = &\frac14 \, a \, \mathbf{\hat{x}}+ \frac14 \, a \, \mathbf{\hat{z}}& \left(24d\right) & \mbox{Ca II} \\ \mathbf{B}_{6} & = &\frac12 \, \mathbf{a}_{1}+ \frac12 \, \mathbf{a}_{3}& = &\frac14 \, a \, \mathbf{\hat{x}}+ \frac12 \, a \, \mathbf{\hat{y}}+ \frac14 \, a \, \mathbf{\hat{z}}& \left(24d\right) & \mbox{Ca II} \\ \mathbf{B}_{7} & = &\frac12 \, \mathbf{a}_{3}& = &\frac14 \, a \, \mathbf{\hat{x}}+ \frac14 \, a \, \mathbf{\hat{y}}& \left(24d\right) & \mbox{Ca II} \\ \mathbf{B}_{8} & = &\frac12 \, \mathbf{a}_{1}+ \frac12 \, \mathbf{a}_{2}& = &\frac14 \, a \, \mathbf{\hat{x}}+ \frac14 \, a \, \mathbf{\hat{y}}+ \frac12 \, a \, \mathbf{\hat{z}}& \left(24d\right) & \mbox{Ca II} \\ \end{array} \]References
- O. Helleis, H. Kandler, E. Leicht, W. Quiring, and E. Wölfel, Die Kristallstrukturen der intermetallischen Phasen Ca33Ge, Ca7Ge, Ca3Pb und Ca5Pb3, Z. Anorg. Allg. Chem. 320, 86–100 (1963), doi:10.1002/zaac.19633200113.
Found in
- P. Villars, Material Phases Data System ((MPDS), CH–6354 Vitznau, Switzerland, 2014). Accessed through the Springer Materials site.