Table 3 Chemical formulas, COD IDs, space groups and band gaps for the chosen 3D twofold self-penetrating structures.

From: Determining dimensionalities and multiplicities of crystal nets

Formula

COD ID

Space group

Band gap (eV)

Cu2O

9007497

Pn − 3m

0.5

Pb2O

1010382

Pn − 3m

0

Ag2O

4318188

Pn − 3m

0

Au2S

1510461

Pn − 3m

2.0

CaC2

9014958

Pn − 3m

1.8

SiC2N4

1526364

Pn − 3m

4.2

Fe4N

9004225

P − 43m

0

Zn(CN)2

4124708

P − 43m

5.9

LiB(CN)4

4308584

P − 43m

6.3

CuB(CN)4

4308583

P − 43m

3.2

ZnPd(CN)4

7211957

P42/mcm

4.2

ZnPt(CN)4

7211958

P42/mcm

4.0

ZnNi(CN)4

7211956

P42/mcm

3.1

AgAu(CN)4

4345897

P2/c

2.8

LiN4C6

4121263

P2/c

0

Ag3BO3

1509905

R32

0

  1. The materials with zero band gaps are metals or semimetals.