where ~ P ¼ n 1 ~ a and ~
Q ¼ n 2 ~ b are measured in terms of primitive vectors ~ a, ~ b and
c is the angle between them.
(c) When we add a third non-coplanar translation “c” to the entire plane pattern due
to translations “a” and “b,” a three-dimensional lattice is obtained (Fig. 1.4).
Like a plane lattice, a space lattice also exhibits a similar characteristic feature
and hence any two points connected through a translation vector ~ T is given by
Fig. 1.1 One-dimensional array of: a objects, b points; a linear lattice
Fig. 1.2 Two-dimensional array of: a objects, b points; a plane lattice
Fig. 1.3 Translation vector,
t 1 and t 2
2
1 Unit Cell Composition