Table 1 Parameters used for quantum calculations.

From: Anomalous piezoelectricity in two-dimensional graphene nitride nanosheets

 

a0 (Å)

c/a 0

Cutoff energy (Ry)

k-points

β

3.172

0.76

80.0

4 × 4 × 10

Sheet

2.379

1.80

30.0

9 × 15 × 1

Stack

2.383

1.26

30.0

4 × 8 × 9

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