Table 1 The calculated lattice constant a, the bilayer thickness d, and the bond lengths l1 and l2 of the long and short edges of the octagons of the OT allotropes (a, d, l1 and l2 all in units of angstrom).

From: A new structure of two-dimensional allotropes of group V elements

 

a

d

l 1

l 2

P

6.43

1.27

2.28

2.24

As

7.08

1.42

2.53

2.49

Sb

8.05

1.67

2.91

2.87

Bi

8.47

1.76

3.05

3.02

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