I see tons of papers referencing this structure but none show what it looks like.


2 Answers 2


You can look at the $\text{Sm}_5 \text{Ge}_4$ crystal structure at Materials Project here.

enter image description here


In Crystal structure of Sm5Ge4, the structure is described as orthorhombic with $a = 7.75\,\mathring{A}$, $b = 14.94\,\mathring{A}$ and $c = 7.84\,\mathring{A}$, having four $\ce{Sm5Ge4}$ units per unit cell. The authors further denote:

The structure is conveniently described in terms of three layers which occur along the $b$ axis. Layer $G$ contains $\ce{Ge}$ atoms only; layer $S$ $\ce{Sm}$ atoms only Layer $C$ is a combination of $G$ and $S$, but with the roles of $\ce{Ge}$ and $\ce{Sm}$ interchanged. Layer $C$ serves as a mirror plane in $Pnma$, but only as a quasi-mirror plane in $Pn2_1a$. [...]

(Personally, I find it a bit irritating that this article from 1967, which seemingly is the original reference, is not directly cited on the Materials Project page.)


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.