The lattice constant is the length of the conventional (cubic) unit cell. The lattice constant is 0.38 nm and the atomic weight of the atoms is 85. What is the Bravais lattice? What shape does the Wigner-Seitz cell have? What are the positions of the atoms of the basis given in fractional coordinates of the conventional (cubic) unit cell? Draw a (111) plane.ģ.18 Calculate the angle between the direction and the direction for a monoclinic lattice with a = 0.3 nm, b = 0.4 nm, c = 0.5 nm, and β = 107°.ģ.19 A metal has an fcc crystal structure. Determine the normal distance between the two planes.ģ.17 Draw the NaCl crystal structure. What is the length of the translation vector with $h = 4$, $k = 3$, and $l = 1$ ?ģ.16 Draw the (111) and (222) planes in a simple cubic unit cell, with lattice constant $a$. From this information determine the primitive lattice vectors.
One way is to repeat the primitive unit cell at each translation vector, In a crystal, atoms are arranged in straight rows in a three-dimensional periodic pattern.Ī small part of the crystal that can be repeated to form the entire crystal is called a unit cell.Ī crystal can be specified in several ways.
