The crystal structure of iron is BCC at temperatures below 910 °C and FCC above. In cubic zinc sulphide, each zinc atom
Posted: Tue Apr 26, 2022 7:17 pm
- The Crystal Structure Of Iron Is Bcc At Temperatures Below 910 C And Fcc Above In Cubic Zinc Sulphide Each Zinc Atom 1 (89.73 KiB) Viewed 36 times
The crystal structure of iron is BCC at temperatures below 910 °C and FCC above. In cubic zinc sulphide, each zinc atom is at a distance of 0.234 nm from the nearest sulphur atom. 1.1) Compute the ratio of the densities of two structures under the assumption that the atoms can be considered to be close-packed spheres the diameters of which are the same in both structures. (5) Compute the density of zinc sulphide in this phase. (5) The density of BCC iron is 7 900 kg/m3. Determine the lattice constant of the cubic unit cell. (3) 1.2 1.3 2. For a simple hexagonal lattice, we can choose the following primitive vectors: - LXO V3 1 a = ax + zaly z V3 h = Zdex + zaly Ĉ= cez What volume does the primitive cell have? Deduce the primitive vectors for the reciprocal lattice. 2.1 (4) (8) 2.2 Page 1 of 2