Mn$_{2}$Co$_{2}$C Structure: AB2C2_tP5_123_b_e_ac-001
| Prototype | CCo$_{2}$Mn$_{2}$ |
| AFLOW prototype label | AB2C2_tP5_123_b_e_ac-001 |
| ICSD | 44353 |
| Pearson symbol | tP5 |
| Space group number | 123 |
| Space group symbol | $P4/mmm$ |
| AFLOW prototype command |
aflow --proto=AB2C2_tP5_123_b_e_ac-001
--params=$a, \allowbreak c/a$ |
- We have inferred the value of $a$ and the positions of the atoms from Figure 2(a) of (Holtzman, 1959) and Figure 3 of (Murthy, 1969), shifting the origin to be on the Mn$_{II}$ atom. The value of $c$ was inferred from the C-Mn$_{II}$ distance given in the paper. This is a pseudo-cubic lattice, with $c/a ≈ 1$.
\[ \begin{array}{ccc}
\mathbf{a_{1}}&=&a \,\mathbf{\hat{x}}\\\mathbf{a_{2}}&=&a \,\mathbf{\hat{y}}\\\mathbf{a_{3}}&=&c \,\mathbf{\hat{z}}
\end{array}\]
Basis vectors
| Lattice coordinates | Cartesian coordinates | Wyckoff position | Atom type | |||
|---|---|---|---|---|---|---|
| $\mathbf{B_{1}}$ | = | $0$ | = | $0$ | (1a) | Mn I |
| $\mathbf{B_{2}}$ | = | $\frac{1}{2} \, \mathbf{a}_{3}$ | = | $\frac{1}{2}c \,\mathbf{\hat{z}}$ | (1b) | C I |
| $\mathbf{B_{3}}$ | = | $\frac{1}{2} \, \mathbf{a}_{1}+\frac{1}{2} \, \mathbf{a}_{2}$ | = | $\frac{1}{2}a \,\mathbf{\hat{x}}+\frac{1}{2}a \,\mathbf{\hat{y}}$ | (1c) | Mn II |
| $\mathbf{B_{4}}$ | = | $\frac{1}{2} \, \mathbf{a}_{2}+\frac{1}{2} \, \mathbf{a}_{3}$ | = | $\frac{1}{2}a \,\mathbf{\hat{y}}+\frac{1}{2}c \,\mathbf{\hat{z}}$ | (2e) | Co I |
| $\mathbf{B_{5}}$ | = | $\frac{1}{2} \, \mathbf{a}_{1}+\frac{1}{2} \, \mathbf{a}_{3}$ | = | $\frac{1}{2}a \,\mathbf{\hat{x}}+\frac{1}{2}c \,\mathbf{\hat{z}}$ | (2e) | Co I |
References
- A. H. Holtzman and I. G. P. Conrad, Structural and Magnetic Properties of Mn‐Co‐C Alloys, J. Appl. Phys. 30, 103S–104S (1959), doi:10.1063/1.2185842.
- N. S. S. Murthy, R. J. Begum, C. S. Somanathan, B. S. Srinivasan, and M. R. L. N. Murthy, Ferrimagnetic structure of Mn$_{2}$Co$_{2}$C, J. Phys.: Conf. Ser. 30, 939–945 (1969), doi:10.1016/0022-3697(69)90291-1.
Prototype Generator
aflow --proto=AB2C2_tP5_123_b_e_ac --params=$a,c/a$