Table 1 Ionic radius of elements (from ref. 28).

From: Preparation and characterization of a new graphite superconductor: Ca0.5Sr0.5C6

Element

Coordination number

Ionic radius (Å)

Li

6

0.76

K

6

1.38

Cs

6

1.67

Ca

6

1.0

Sr

6

1.18

Yb

6

1.02

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