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Figure 1
Twelve unit cells of sulfur, of type oF, in the intervals u = [−1, 5], v = [0, 1], w = [0, 2]. The unit cell in black is obtained by the transformation a′ = 5a + c; b′ = b; c′ = −a + c, based on the incorrectly simplified Miller and direction indices of the lattice elements (plane, direction) defining the twin lattice, namely (101) and [501]. This unit cell is B centred and has a volume six times larger that the unit cell of the individual crystal, which would suggest a twin index n = 6 × 4/2 = 12, but actually contains lattice nodes also at ![]() ![]() ![]() ![]() |