What are the crystal structures for each of the following metals?
Cu, Mg, Iron at room temperature Draw their unit cells.
Answers
Answer:
Model of the face-centered cubic crystal structure of copper showing one unit cell. Distance between centers of corner atoms is 3.6 angstroms (Reference 1). The copper atom is quite similar to an atom of gold or silver, which together with copper make up a group in the periodic table of the elements.
The crystal structure of magnesium phosphite hexahydrate, MgHPO3. 6H20, has been determined by Fourier methods. The lattice is rhombohedral, with unit-cell dimensions aR ---- 5"96 A, a = 96� 24'. The space group is R3 and the Mg, P and H atoms lie on the unique axis.
Pure iron can have two different crystal structures as its temperature is increased from room temperature to its melting point. At room temperature it is body-centered cubic, between 912 and 1394 C if is face- centered cubic, and between 1394 and its melting point at 1538 C it returns to body-centered cubic.