Question

1. Differentiate crystal structure, crystal system, and crystal form.
2. How to find what a materials crystal structure is? (FCC, BCC or neither FCC or BCC or others)
3. Describe the crystal structure of iron, which crystallizes with two equivalent metal atoms in a cubic unit cell.
4. Silver has a face-centered cubic unit cell. How many atoms of Ag are present in each unit cell?
5. Copper crystallizes in a face-centered cubic structure. What is the mass of one unit?
6. What is the edge length of a simple cubic unit cell made up of atoms having a radius of 158 pm?
7. State the number of atoms on a plane having the miller indices of 110 in a BCC unit cell.

Answer 1

FCC: atoms are arranged at the corners and center of each cube face of the cell.

BCC: unit cell has atoms at each of the eight corners of a cube plus one atom in the center of the cube.

Amorphous or non-crystalline solid is a solid that lacks the long-range order that is characteristic of a crystal.